President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE on Thursday went after Senate Minority Leader Charles Schumer Chuck SchumerMcConnell accuses Democrats of sowing division by 'downplaying progress' on election security Warren, Schumer introduce plan for next president to cancel ,000 in student debt Schumer lashes out at Trump over 'blue states' remark: 'What a disgrace' MORE (D-N.Y.), saying it is "funny to watch" him "groveling" and highlighting the Democratic leader's past criticisms of former FBI Director James Comey James Brien ComeyTrump jabs at FBI director over testimony on Russia, antifa Graham: Comey to testify about FBI's Russia probe, Mueller declined invitation Barr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' MORE.

So funny to watch Schumer groveling. He called for the firing of bad cop James Comey many times - UNTIL I FIRED HIM! — Donald J. Trump (@realDonaldTrump) January 17, 2019

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Trump tweeted earlier in the day that the "Left has become totally unhinged."

Schumer said of Comey in November 2016 that he did not "have confidence in him any longer" after the then-FBI director reopened an investigation into then-Democratic presidential candidate Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE just days before the election.

"To restore my faith, I am going to have to sit down and talk to him and get an explanation for why he did this," Schumer said at the time.

It's not clear what prompted Trump's tweet Thursday morning. He has clashed with Schumer in recent weeks over negotiations during the ongoing partial government shutdown, which entered its 27th day on Thursday.

Schumer on Wednesday said he hasn't heard from Trump since a meeting earlier this month that the president walked out of and called a "waste of time" after Democrats refused his demand to fund a wall along the southern border.

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Schumer also indicated on Wednesday that he would oppose Trump's pick for attorney general, William Barr, amid concerns over how he would handle special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's investigation into Russian interference in the 2016 election.

"We do not have the kind of strong and clear commitments to the report being issued and there being no interference in the investigation that are needed, particularly now with President Trump treating the Justice Department as he has," Schumer said.

In his explanation, Schumer repeatedly mentioned Trump's attacks on the Justice Department. The president earlier this week decried Comey as a "dirty cop," and called agents who launched an inquiry into whether he was working for Russia "known scoundrels."

"I think when we have a president like Trump who has treated the Justice Department as poorly as he has, who has tried to browbeat it into doing what he wants despite rule of law, that you need somebody who reaches a really high standard," Schumer told reporters. "And while (Barr) has had a very fine career, when he refuses to commit to those things that I mentioned, he does not meet that standard."