Rep. Alexandria Ocasio-CortezAlexandria Ocasio-CortezFive takeaways from the Ohio special primaries Shontel Brown wins Ohio Democratic primary in show of establishment strength On The Money: Biden issues targeted eviction moratorium | GOP skepticism looms over bipartisan spending deal MORE (D-N.Y.) is amplifying her calls for the House begin impeachment proceedings against President TrumpDonald TrumpFive takeaways from the Ohio special primaries Missouri Rep. Billy Long enters Senate GOP primary Trump-backed Mike Carey wins GOP primary in Ohio special election MORE.

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While Speaker Nancy PelosiNancy PelosiFive takeaways from the Ohio special primaries On The Money: Biden issues targeted eviction moratorium | GOP skepticism looms over bipartisan spending deal 'The Squad' celebrates Biden eviction moratorium 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) MuellerSenate Democrats urge Garland not to fight court order to release Trump obstruction memo Why a special counsel is guaranteed if Biden chooses Yates, Cuomo or Jones as AG Barr taps attorney investigating Russia probe origins as special counsel 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 NadlerBiden backs effort to include immigration in budget package Biden to meet with 11 Democratic lawmakers on DACA: report Britney Spears's new attorney files motion to remove her dad as conservator 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.”