Rep. Ted Lieu (D-Calif.) on Sunday suggested 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 recent Twitter rant about FBI Deputy Director Andrew McCabe is actually a "gift" to special counsel Robert Mueller.

“Trump’s Twitter feed is the gift that keeps on giving. Merry Christmas Robert Mueller,” Lieu tweeted.

.@POTUS has tweeted quite a bit about career FBI official Andrew McCabe, who could be called as a witness against Trump in an Obstruction of Justice case. Trump's Twitter feed is the gift that keeps on giving. Merry Christmas Robert Mueller. pic.twitter.com/gIG0LIhSoQ — Ted Lieu (@tedlieu) December 24, 2017

Mueller is conducting an investigation into possible collusion between the Trump campaign and Russia, a wide-ranging investigation that many Trump critics hope will lead to obstruction of justice charges for the president. The probe has thus far netted two indictments and two guilty pleas.

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Trump has in recent days torn into the FBI, specifically targeting McCabe. Trump has gone after McCabe over his wife’s ties to prominent Democrats.

“FBI Deputy Director Andrew McCabe is racing the clock to retire with full benefits. 90 days to go?!!!” Trump tweeted Saturday.

The president interviewed McCabe to be FBI director in May, after Trump fired 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 from the post. Trump ultimately tapped Christopher Wray to lead the bureau.

Wray is reportedly under pressure to remove McCabe, who Trump also apparently sees as too closely tied to Comey.

McCabe spent hours behind closed doors this week on Capitol Hill being interviewed by members of three congressional committees probing Russia's interference in the election and the FBI's handling of federal probes.

Lieu has been a frequent and vocal critic of Trump’s. He gave a floor speech last week warning the president that firing Mueller “will not end well for him.”

He has previously said Congress will move to impeach Trump if he fires Mueller.

Trump and the White House have said the president is not considering firing the special counsel.