Rep. Alexandria Ocasio-CortezAlexandria Ocasio-CortezRepublicans plot comeback in New Jersey Joseph Kennedy mulling primary challenge to Markey in Massachusetts The latest victims of the far-left's environmental zealotry: Long Islanders MORE (D-N.Y.) is amplifying her calls for the House begin impeachment proceedings against President TrumpDonald John TrumpO'Rourke: Trump driving global, U.S. economy into recession Manchin: Trump has 'golden opportunity' on gun reforms Objections to Trump's new immigration rule wildly exaggerated MORE.

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While Speaker Nancy PelosiNancy PelosiObjections to Trump's new immigration rule wildly exaggerated Latest pro-democracy rally draws tens of thousands in Hong Kong Lewandowski on potential NH Senate run: If I run, 'I'm going to win' 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 calls for probe of Obama book deal Democrats express private disappointment with Mueller testimony Kellyanne Conway: 'I'd like to know' if Mueller read his own report 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 NadlerGOP memo deflects some gun questions to 'violence from the left' House Democrats urge Trump to end deportations of Iraqis after diabetic man's death French officials call for investigation of Epstein 'links with France' 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.”