Rep. Alexandria Ocasio-CortezAlexandria Ocasio-CortezOcasio-Cortez on food assistance cuts: 'If this happened then, we might've just starved' Youth climate activists grade top 2020 Democrats on Green New Deal commitment Sanders to join youth climate strikers in Iowa MORE (D-N.Y.) is amplifying her calls for the House begin impeachment proceedings against President TrumpDonald John TrumpTrumps light 97th annual National Christmas Tree Trump to hold campaign rally in Michigan 'Don't mess with Mama': Pelosi's daughter tweets support following press conference comments MORE.

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While Speaker Nancy PelosiNancy Pelosi 'Don't mess with Mama': Pelosi's daughter tweets support following press conference comments Bloomberg: Trump should be impeached On The Money: Congress races to beat deadline on shutdown | Trump asks Supreme Court to shield financial records from House Democrats | House passes bill to explicitly ban insider trading 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 MuellerTrump says he'll release financial records before election, knocks Dems' efforts House impeachment hearings: The witch hunt continues Speier says impeachment inquiry shows 'very strong case of bribery' by 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 NadlerTurley: Democrats offering passion over proof in Trump impeachment GOP lawmaker: 'Amazing' Democrats would ask if Founding Fathers would back Trump impeachment Trump asks if Democrats 'love our country' amid ongoing impeachment 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.”