Within minutes of receiving notification that special counsel Robert Mueller had turned over his report on the Russia investigation, congressional Democrats were calling for the report to be fully released, including the underlying evidence. They have threatened subpoenas if it is not.

The demands are setting up a potential tug of war between congressional Democrats and President Donald Trump's administration that federal judges might eventually have to referee.

Six Democratic committee chairmen wrote in a letter to Attorney General William Barr on Friday that if Mueller has any reason to believe that Trump "has engaged in criminal or other serious misconduct," then the Justice Department should not conceal it.

"The president is not above the law and the need for public faith in our democratic institutions and the rule of law must be the priority," the chairmen wrote.

Reacting to the release, Democratic Congressman Ted Lieu, who serves on the Judiciary Committee, told the Associated Press that "the American people paid for this report," adding "both American people and Congress have a right to see the full report. "

Lieu said although the special counsel report focused on Russia, the findings could also be used in a wide array of Judicary Committee investigations.

It's unclear what Mueller has found related to the president, or if any of it would be damning. In his investigation of whether President Donald Trump's campaign coordinated with Russia to sway the 2016 election, Mueller has already brought charges against 34 people, including six aides and advisers to the president, and three companies.

Lawmakers say they need the underlying evidence - including interviews, documents and material turned over to the grand jury - because the Justice Department has maintained that a president cannot be indicted, and also that derogatory information cannot be released about people who have not been charged. So if the investigation did find evidence incriminating against Trump, they may not be able to release it, under their own guidelines.

The Democrats say that it could be tantamount to a cover-up if the department did not let Congress and the public know what they found.

Washington - 22 March 2019

1. Wide, exterior view of Department of Justice

Los Angeles - 3 May 2018

2. STILL Image, Rep. Ted Lieu, Democrat - California, Member of House Judiciary Committee

Torrence, California - 22 March 2019

3. SOUNDBITE (English) Rep. Ted Lieu, Democrat - California: ++ AUDIO ONLY++

"Today is a proud day for America. Despite many attempts by Donald Trump to block this investigation Robert Mueller and his team were able to complete it. The fact that Mueller and Deputy Attorney General Rod Rosenstein kept their jobs I think is a strong testament to the vitality and strength of our institutions. This was a Republican led investigation of a Republican president and it was allowed to continue. I think that says a lot about America."

Washington - 22 March 2019

4. Wide, exterior view of Special Counsel Robert Mueller's office

Torrence, California - 22 March 2019

5. SOUNDBITE (English) Rep. Ted Lieu, Democrat - California: ++ AUDIO ONLY++

"Now in terms of distribution, the American people paid for this report. It is a matter of intense national interest and under both the separation of powers as well as just general fairness and transparency, both American people and Congress have a right to see the full report. "

Washington - 22 March 2019

6. Wide, exterior view of Department of Justice ++NIGHT SHOT++

Torrence, California - 22 March 2019

7. SOUNDBITE (English) Rep. Ted Lieu, Democrat - California: ++ AUDIO ONLY++

"It's hard to know without knowing what's in the actual report. It's also important to understand that because the Department of Justice has taken the position that they won't indict a sitting president then the only other institution that can hold the press accountable is Congress. And we can't do that if we don't see the full report. So, that at every level when you look at it from separation of powers or the functions of both Congress and the special counsel in this case, the different functions we have to see the entire report."

Washington - 22 March 2019

8. Wide, people standing in front of White House

9. Close-up protester

Torrence, California - 22 March 2019

10. SOUNDBITE (English) Rep. Ted Lieu, Democrat - California: ++ AUDIO ONLY++

"Special Counsel Mueller's investigation was largely centered on Russia. The House Judiciary Committee and other committees were interested in knowing did Donald Trump, his family, his associates commit any crime? Second, did they engage in any ethical misconduct, whether or not it rose to the level of a federal crime? And third how do we explain this to the American people to keep it from happening again?"

Washington - 22 March 2019

11. Wide, tourists walking in front of White House

12. Wide, White House ++NIGHT SHOT++

In an extraordinary indictment, the U.S. special counsel accused 13 Russians Friday of an elaborate plot to disrupt the 2016 presidential election, charging them with running a huge but hidden social media trolling campaign aimed in part at helping Republican Donald Trump defeat Democrat Hillary Clinton.

The federal indictment, brought by special counsel Robert Mueller, represents the most detailed allegations to date of illegal Russian meddling during the campaign that sent Trump to the White House. It also marks the first criminal charges against Russians believed to have secretly worked to influence the outcome.

The latest indictment does not focus on hacking but instead centers on a social media propaganda effort that began in 2014 and continued past the election, with the goal of producing distrust in the American political process.

The indictment does not allege that any American knowingly participated in Russian meddling, or suggest that Trump campaign associates had more than "unwitting" contact with some of the defendants who posed as Americans during election season.

But it does lay out a vast and wide-ranging Russian effort to sway political opinion in the United States through a strategy that involved creating Internet postings in the names of Americans whose identities had been stolen; staging political rallies while posing as American political activists and paying people in the U.S. to promote or disparage candidates.

"This involved having agents sometimes come to the U.S. from Russia and start all sorts of interest groups on Facebook and other social media and then to entice people, not only into joining those groups, but also to have them post a great deal of material on the social networks, a lot of it aimed at criticizing Hillary Clinton and rivals to Donald Trump during the Republican primaries," said AP technology editor David Hamilton.  

While foreign meddling in U.S. campaigns is not new, the indictment for an effort of this scope and digital sophistication is unprecedented.

The surreptitious campaign was organized by the Internet Research Agency, a notorious Russian troll farm that the indictment says sought to conduct "information warfare against the United States of America."

The election-meddling organization, looking to conceal its Russian roots, purchased space on computer servers within the U.S., used email accounts from U.S. internet service providers and created and controlled social media pages with huge numbers of followers on divisive issues such as immigration, religion and the Black Lives Matter movement.

Starting in April 2016, the indictment says, the Russian agency bought political ads on social media supporting Trump and opposing Clinton without reporting expenditures to the Federal Election Commission or registering as foreign agents. Among the ads: "JOIN our #HillaryClintonForPrison2016" and "Donald wants to defeat terrorism ... Hillary wants to sponsor it."

The indictment also asserts that the posts encouraged minority groups not to vote or to vote for third parties and alleged Democratic voter fraud.

Facebook says it is doubling its security staff to 20,000 and actively working with the FBI to stop election interference by Russians and others.

Washington, D.C. - 16 February 2018

1. SOUNDBITE (English) Rod Rosenstein, Deputy Attorney General:

"A grand jury in the District of Columbia today returned an indictment presented by the special counsel's office. The indictment charges 13 Russian nationals and three Russian companies for committing federal crimes while seeking to interfere in the United States political system."

2. Various views of the U.S. Department of Justice statement regarding the Russia indictment

San Francisco - 16 February 2018

3. SOUNDBITE (English) David Hamilton, AP Technology Editor:

"It basically lays out a strategy by a Russian organization called the internet research agency to interfere with the 2016 presidential election. This involved having agents sometimes come to the U.S. from Russia and start all sorts of interest groups on Facebook and other social media and then to entice people, not only into joining those groups, but also to have them post a great deal of material on the social networks, a lot of it aimed at criticizing Hillary Clinton and rivals to Donald Trump during the Republican primaries while also supporting Bernie Sanders and Donald Trump himself."

Washington, D.C. - 16 February 2018

4. Still image of Facebook posting released by the House Intelligence Committee

San Francisco - 16 February 2018

5. SOUNDBITE (English) David Hamilton, AP Technology Editor:

"It's been a rough year for Facebook and Twitter and YouTube and the like. They all got hauled up in front of congressional committees back in November and quizzed extensively about this. They say they've taken a number of actions including hiring more people to vet the sort of material that's published on their networks and to try to screen out false and misleading accounts. But experts have a lot of doubts as to whether they've actually gone far enough in terms of being able to deal with this and to be ready, for instance, for the 2018 midterms."

6. SOUNDBITE (English) David Hamilton, AP Technology Editor:

"As far as what can be done, I think that's the biggest question everybody's trying to wrestle with right now, the companies, the government, users of the social media organizations themselves."