President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE in a tweet on Wednesday quoted his former lawyer John Dowd criticizing 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 Trump's possible involvement with Russian collusion during the 2016 election.

“This isn’t some game,” Dowd told Mueller during a meeting in March, according to The Washington Post. “You are screwing with the work of the president of the United States.”

The president quoted Dowd in his tweet and added that, with all the international issues the U.S. currently faces, "there is not much time to be thinking about this, especially since there was no Russian ‘Collusion.’”

“This isn’t some game. You are screwing with the work of the president of the United States.” John Dowd, March 2018. With North Korea, China, the Middle East and so much more, there is not much time to be thinking about this, especially since there was no Russian “Collusion.” — Donald J. Trump (@realDonaldTrump) May 2, 2018

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The president’s remarks come after reports that Mueller suggested to Trump’s lawyers in the same March meeting that he would subpoena the president if Trump refused to talk with his team.

Dowd, who had been leading the response to Mueller’s investigation, abruptly resigned in March because of reported disputes over the team's strategy for responding to Mueller's probe.

The New York Times on Monday reported a list compiled by Mueller's team of questions to present to Trump. According to the Post, Trump’s legal team actually created the list of questions they thought Mueller’s team would want to ask the president. The questions were based on topics that Mueller’s team had said they wanted to discuss with Trump.

Trump criticized the reported list of questions on Tuesday while claiming that the questions didn’t focus on alleged collusion.

The list included questions about the decision to fire national security adviser Michael Flynn and FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE, whether the president communicated with Russian President Vladimir Putin during the election and reports that the president wanted to fire Mueller.