Democratic National Committee (DNC) Chairman Tom Perez Thomas Edward PerezClinton’s top five vice presidential picks Government social programs: Triumph of hope over evidence Labor’s 'wasteful spending and mismanagement” at Workers’ Comp MORE says that former FBI Director James Comey James Brien ComeySteele Dossier sub-source was subject of FBI counterintelligence probe Judge will not dismiss McCabe's case against DOJ Democrats fear Russia interference could spoil bid to retake Senate MORE’s public testimony is the “most damning evidence yet” of President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s wrongdoing.

“Comey’s testimony just gave us the clearest and most damning evidence yet that President Trump lied to the American people and is likely under investigation for obstruction of justice — a serious and disturbing charge,” he said in a statement Thursday.

“While Trump continues to attempt to protect himself and his friends, today’s testimony shows that he doesn’t care about the attacks on our democracy and on the American people,” Perez added.

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“This behavior should alarm every member of Congress and every American citizen. Justice must be blind. Democrats and Republicans alike must stand together to see that it is served.”

White House spokeswoman Sarah Huckabee Sanders on Thursday defended Trump’s honesty hours after Comey’s testimony before the Senate Intelligence Committee.

“I can definitively say the president is not a liar,” she told reporters during an off-camera briefing at the White House. “I think it is frankly insulting that that question would be asked.”

Comey earlier Thursday accused Trump’s administration of defaming him and telling “lies” since the president abruptly fired him last month.

“The administration chose to defame me and, more importantly, the FBI by saying that the organization was in disarray, that it was poorly run,” he told the Senate panel. “Those were lies, plain and simple.”

Trump shocked Washington last month by ousting Comey amid the FBI’s probe of Russian meddling in the 2016 presidential race.

Critics argue the timing of Comey’s ouster was suspicious as the bureau’s investigation includes possible collusion between Russia and Trump’s election campaign.