Rep. Alexandria Ocasio-CortezAlexandria Ocasio-CortezOcasio-Cortez: Sanders' heart attack was a 'gut check' moment Ocasio-Cortez tweets endorsement of Sanders Ocasio-Cortez throws support to Sanders at Queens rally MORE (D-N.Y.) is amplifying her calls for the House begin impeachment proceedings against President TrumpDonald John TrumpPelosi arrives in Jordan with bipartisan congressional delegation Trump says his Doral resort will no longer host G-7 after backlash CNN's Anderson Cooper mocks WH press secretary over Fox News interview MORE.

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While Speaker Nancy PelosiNancy PelosiPelosi arrives in Jordan with bipartisan congressional delegation Trump says his Doral resort will no longer host G-7 after backlash Scrap House defense authorization provision benefitting Russia 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 MuellerFox News legal analyst says Trump call with Ukraine leader could be 'more serious' than what Mueller 'dragged up' Lewandowski says Mueller report was 'very clear' in proving 'there was no obstruction,' despite having 'never' read it Fox's Cavuto roasts Trump over criticism of network 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 NadlerDem committee chairs blast Trump G-7 announcement Top Democrat holds moment of silence for Cummings at hearing Barr to speak at Notre Dame law school on Friday 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.”