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

President TrumpDonald John Trump2020 Democrats spar over socialism ahead of first debate Senate passes .5 billion border bill, setting up fight with House 'Teflon Don' avoids the scorn of the 'family values' GOP — again 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 PelosiSenate passes .5 billion border bill, setting up fight with House Pelosi: Congress will receive election security briefing in July Trump says he spoke to Pelosi, McConnell on border package MORE (D-Calif.) and Senate Minority Leader Charles SchumerCharles (Chuck) Ellis SchumerTrump goes after Democrats over photo of drowned migrants Schumer displays photo of drowned migrants on Senate floor in appeal to Trump McConnell-backed Super PAC says nominating Roy Moore would be 'gift wrapping' seat to Dems 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 MuellerTop Republican considered Mueller subpoena to box in Democrats Kamala Harris says her Justice Dept would have 'no choice' but to prosecute Trump for obstruction Dem committees win new powers to investigate Trump 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.