Rep. Alexandria Ocasio-CortezAlexandria Ocasio-CortezGeorge Conway calls Trump a 'racist president' in new op-ed House Democrats introduce resolution condemning Trump for 'racist' comments Trump's family separation policy has taken US to 'lowest depth possible,' says former immigration lawyer MORE (D-N.Y.) is amplifying her calls for the House begin impeachment proceedings against President TrumpDonald John TrumpCNN's Camerota clashes with Trump's immigration head over president's tweet LA Times editorial board labels Trump 'Bigot-in-Chief' Trump complains of 'fake polls' after surveys show him trailing multiple Democratic candidates MORE.

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While Speaker Nancy PelosiNancy PelosiNYT's Friedman repeatedly says 's---hole' in tirade against Trump on CNN GOP lawmaker: Trump's tweets 'obviously not racist' On the USMCA, Pelosi can't take yes for an answer MORE (D-Calif.) and other congressional leaders have tried to tamp down impeachment talk, Ocasio-Cortez and other voices on the left have been growing impatient as the White House increasingly rejects congressional oversight efforts.

“We have to move forward,” Ocasio-Cortez told CNN on Tuesday. “I trust the Speaker's taking a measured approach to ensure that we’re moving everyone forward." 

“Being a Speaker is hard, and holding this party together is a difficult task,” she added, “but I think we have to move forward.”

The House is currently conducting multiple investigations into Trump in the wake of special counsel Robert MuellerRobert (Bob) Swan MuellerTop Republican considered Mueller subpoena to box in Democrats Kamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate Trump MORE's probe into Russian election interference, but the president is increasingly ignoring subpoenas and telling officials not to testify.

Former White House counsel Don McGahn on Tuesday defied a subpoena from the House Judiciary Committee after being advised to do so by the administration, prompting Judiciary Chairman Jerrold NadlerJerrold (Jerry) Lewis NadlerTrump knocks Mueller after deal struck for him to testify House Democrats request briefing on Epstein, Acosta Nadler apologized after repeatedly calling Hope Hicks 'Ms. Lewandowski' at hearing MORE (D-N.Y.) to accuse Trump of witness intimidation.

“Our subpoenas are not optional,” Nadler said Tuesday. “Mr. McGahn has a legal obligation to be here for his scheduled appearance. If he does not immediately correct his mistake, this committee will have no choice but to enforce the subpoena against him.”