Trump: Not possible for Democrats to 'investigate and legislate at the same time'

President TrumpDonald John TrumpMnuchin knocks Greta Thunberg's activism: Study economics and then 'come back' to us The Hill's Morning Report - House prosecutes Trump as 'lawless,' 'corrupt' What to watch for on Day 3 of Senate impeachment trial MORE hit congressional Democrats early Thursday, saying lawmakers on Capitol Hill cannot "investigate and legislate at the same time."

"The Democrats are getting nothing done in Congress. All of their effort is about a Re-Do of the Mueller Report, which didn’t turn out the way they wanted," Trump wrote on Twitter. "It is not possible for them to investigate and legislate at the same time."

The president went on to accuse Democrats of being focused on "trying to find anything which will be bad for me."

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"Their heart is not into Infrastructure, lower ... drug prices, pre-existing conditions and our great Vets. All they are geared up to do, six committees, is squander time, day after day, trying to find anything which will be bad for me," he tweeted.

"A pure fishing expedition like this never happened before, & it should never happen again!" 

Trump's comments came one day after he abruptly ended an infrastructure meeting with Democratic leaders.

The president cut off a meeting with House Speaker Nancy PelosiNancy PelosiSekulow indicates White House not interested in motion to dismiss impeachment articles Overnight Health Care: Trump restores funding for Texas program that bars Planned Parenthood | Trump to attend March for Life | PhRMA spent record on 2019 lobbying Key House committee chairman to meet with Mnuchin on infrastructure next week MORE (D-Calif.) and Senate Minority Leader Charles SchumerCharles (Chuck) Ellis SchumerCollins walks impeachment tightrope 'Emotion' from Trump's legal team wins presidential plaudits Biden says he would not engage in witness swap in impeachment trial MORE (D-N.Y.) after Pelosi accused the president of engaging in a "cover-up." Trump, appearing in the White House Rose Garden shortly after the meeting, said the negotiations would not resume until Democrats ended their investigations into him.  

Democrats have become increasingly frustrated in recent days as the White House has ramped up its effort to stonewall their investigations into Trump’s administration, campaign and businesses. 

The White House instructed former White House counsel Don McGahn not to testify on Tuesday to the House Judiciary Committee, blocking Democrats' chance to hear from a key witness in special counsel Robert MuellerRobert (Bob) Swan MuellerSchiff: Trump acquittal in Senate trial would not signal a 'failure' Jeffries blasts Trump for attack on Thunberg at impeachment hearing Live coverage: House Judiciary to vote on impeachment after surprise delay MORE's Russia investigation. The White House also invoked executive privilege to block the release of Mueller’s full report on Moscow’s election interference and Trump’s possible obstruction of justice.

Wednesday's public blowup between Trump and congressional Democrats came as House Democratic leaders face mounting pressure to begin impeachment proceedings against Trump, inflaming partisan tensions in Washington.