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An attorney linked to a former Trump campaign official admitted Tuesday he lied to federal investigators working for special counsel Robert Mueller.

Alex van der Zwaan, who worked at the law firm Skadden, Arps, Slate, Meagher & Flom until he was fired last year, appeared at the federal courthouse in Washington where he formally pleaded guilty to a single charge of making false statements about his interactions with former Trump campaign aide Rick Gates.

Associated Press reporter Eric Tucker says Mueller is sending a clear message that he won't tolerate lying. This is the 4th person to be prosecuted for lying to investigators.

Van der Zwaan's plea comes on the heels of an extraordinary indictment from Mueller last week that charged 13 Russian individuals and three Russian companies in a hidden social media effort to meddle in the 2016 U.S. presidential election by denigrating Democrat Hillary Clinton and boosting the chances of Trump.

But the charge against the attorney, who is also the son-in-law of a Russian billionaire, does not involve election meddling or relate to the Trump campaign's operations. Instead, it stems from the special counsel's investigation into Paul Manafort, Trump's former campaign chair, and Gates, who is a longtime business associate of Manafort.

Gates and Manafort were indicted last year and accused of conspiring to launder millions of dollars they earned from political consulting work in Ukraine. As part of that indictment, Manafort and Gates are accused of directing a covert Washington lobbying campaign on behalf of pro-Russian Ukrainian interests before they joined the Trump campaign. Both have pleaded not guilty.

Van der Zwaan, 33, of London admitted to lying to federal authorities while they questioned him about the production of a report that Manafort and Gates are accused of secretly funding by funneling money through an offshore account.

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Washington - 20 February 2018

1. Mid, van der Zwaan exiting the courthouse and getting into a car

2. SOUNDBITE (English) Eric Tucker, Associated Press Justice Department Reporter:

"Today we had  another guilty plea in special counsel Robert Mueller's investigation. This is a lawyer. His name is Alex van der Zwaan. He admitted to lying to federal investigators during an interview in November 2017. This is the 19th person that we've seen charged so far in Mueller's investigation. This is a person who lied to the FBI about his interactions with Rick Gates, who is a codefendant of Paul Manafort, who is the former campaign chairman of President Donald Trump."

3. Mid, car driving away

4. SOUNDBITE (English) Eric Tucker, Associated Press Justice Department Reporter:

"He went into the special counsel's office back in November 2017 to be interviewed about his interactions with Rick Gates in connection with the production of a report that related to foreign lobbying work, Ukrainian lobbying work, that Rick Gates and Paul Manafort were doing. And during the course of that conversation he was asked about the last interaction he had with Rick Gates. He lied in that interview according to Mueller's investigators."

5. STILL Various van der Zwaan arriving at courthouse

6. SOUNDBITE (English) Eric Tucker, Associated Press Justice Department Reporter:

"The plea today does not relate to the indictment from Friday about the meddling in the 2016 presidential election. And it doesn't directly connect in any way to President Trump or Candidate Trump."

7. STILL Various van der Zwaan arriving at courthouse

8.  SOUNDBITE (English) Eric Tucker, Associated Press Justice Department Reporter:

"But I would say what's really interesting now is this is the fourth person who we have seen charged with lying to investigators. So clearly Mueller is saying if you lie to us, and if we catch you in a lie making a knowing and false and willfully false statement, not just a mistake but a willfully false statement, you could wind up being prosecuted."

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