House Minority Leader Nancy Pelosi Nancy PelosiTrump puts Supreme Court fight at center of Ohio rally CDC causes new storm by pulling coronavirus guidance Overnight Health Care: CDC pulls revised guidance on coronavirus | Government watchdog finds supply shortages are harming US response | As virus pummels US, Europe sees its own spike MORE (D-Calif.) said Friday that former national security adviser Michael Flynn's guilty plea to charges of lying to federal authorities in the Russia probe is a "dark moment" in American history.

“The guilty plea of President Trump’s former National Security Advisor to lying to the FBI about his communications with Russian authorities marks a dark moment in our nation’s history," Pelosi said in a statement.

Flynn pleaded guilty on Friday to charges of lying to the FBI about his conversations during the presidential transition with then-Russian Ambassador to the U.S. Sergey Kislyak.

According to court documents, Flynn lied when he told investigators that he didn't ask Kislyak to "refrain from escalating the situation" in response to sanctions then-President Obama levied on Russia over Moscow's 2016 election meddling.

Flynn's misrepresentations of the conversations happened while he was serving in the administration, according to the court documents.

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Flynn, who resigned as national security adviser in February, weeks after Trump entered office, is the first former Trump administration official to be charged in the wide-reaching investigation into connections between Russia and Trump campaign associates.

Three other former campaign associates, including former Trump campaign chairman Paul Manafort, have also been charged in the probe.

Trump's handling of the federal probe into his campaign associates' contacts with Russia has raised concerns of possible obstruction of justice.

The president previously approached former FBI Director James Comey, whom he later fired, on the investigation into Flynn and told him to "let this go," according to a memo Comey wrote on the exchange.

Flynn is now cooperating with Mueller in the investigation, and is prepared to testify against Trump, who he says directed him to make contact with the Russians, ABC News reported.

“All Americans should be alarmed by reports of President Trump’s consistent efforts to obstruct the Special Counsel and Congressional investigations," Pelosi said in her statement Friday.

“The U.S. Congress has a duty to uphold justice, and to take measures to ensure that Special Counsel Mueller’s investigation proceed without interference from the White House."