Trump labels Schiff ‘little Adam Schitt’

President TrumpDonald John TrumpFamily says Trump travel ban preventing mother from seeing dying son Saudi Arabia rejects Senate position on Khashoggi killing Five things to know about the Trump inauguration investigation MORE on Sunday attacked Rep. Adam SchiffAdam Bennett SchiffCummings: DOJ should 'definitely' reconsider laws against indicting sitting president On The Money: Trump leaves GOP in turmoil with shutdown looming | Trump names Mulvaney acting chief of staff | China agrees to 3-month freeze of auto tariffs | Dem to seek Deutsche Bank records of Trump's personal finances Schiff plans to obtain Deutsche Bank records of Trump's personal finances MORE (D-Calif.), labeling him as "little Adam Schitt" after the congressman suggested the appointment of acting Attorney General Matthew Whitaker was unconstitutional.

"So funny to see little Adam Schitt (D-CA) talking about the fact that Acting Attorney General Matt WhitakerMatthew G WhitakerFox's Kilmeade suggests David Bossie, Matthew Whitaker for chief of staff Comey’s confession: dossier not verified before, or after, FISA warrant Flake stands firm on sending a ‘message to the White House’ on Mueller MORE was not approved by the Senate, but not mentioning the fact that Bob Mueller (who is highly conflicted) was not approved by the Senate!" Trump wrote in a tweet.

Earlier Sunday, Schiff — who will likely be the next chairman of the House Intelligence Committee — said Democrats would challenge the appointment of Whitaker.

Schiff and other Democrats argue that Whitaker, who was appointed by Trump following the resignation of Attorney General Jeff SessionsJefferson (Jeff) Beauregard SessionsTrump: Sessions 'should be ashamed of himself' for allowing Russia probe to proceed Interior chief Zinke to leave administration Trump, Christie met to discuss chief of staff job: report MORE, should be subject to Senate approval.

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Mueller, the special counsel in charge of the Justice Department's investigation of Russian election interference, does not need to be confirmed by the Senate to his position. The attorney general, who is confirmed by the Senate, appoints special prosecutors. 

"Don’t tell me about Whitaker, because Mueller was not Senate confirmed, and Whitaker was, actually," the president said earlier this month.

Mueller was unanimously confirmed by the Senate as FBI director in 2001 and in 2011.

The Senate confirmed Whitaker in 2004 as a U.S. attorney in Iowa, a post he left in 2009.

Schiff later responded to Trump's tweet and got in his own dig.

"Wow, Mr. President, that’s a good one. Was that like your answers to Mr. Mueller’s questions, or did you write this one yourself?" Schiff wrote, referring to reports that Trump's lawyers are writing Trump's answers to written questions from Mueller.

Whitaker has also come under fire for his past criticisms of Mueller's investigation. He now oversees the probe.

Whitaker previously said that he believed the special counsel probe, which includes investigating links between the Trump campaign and Russia, had gone "too far." He also once suggested that the special counsel should be defunded.

Schiff also said Sunday on ABC's "This Week" that the Justice Department's succession statute should have prevented Trump from appointing Whitaker.

"So it's a flawed appointment, but the biggest flaw from my point of view is that he was chosen for the purpose of interfering with the Mueller investigation," Schiff said Sunday.

— Updated 1:50 p.m.