President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE attempted to fire 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 last summer but was stopped after White House counsel Don McGahn threatened to resign, according to a new report.

The New York Times reports Trump ordered Mueller to be fired in June, according to four people with knowledge of the matter.

Trump reportedly said Mueller had conflicts of interest in his investigation of Russian interference in the 2016 election, including a dispute over fees at Trump’s National Golf Club in Virginia and Mueller’s previous employment at a law firm that represent Trump’s son-in-law Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE, according to the Times.

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However, McGahn reportedly refused the president's order and threatened to quit, believing that Trump's order would further stir speculation that the president was obstructing justice in the Russia investigation.

According to the Times, Trump's lawyer Ty Cobb and others in the White House have for months attempted to calm Trump on matters involving Mueller by insisting the investigation is almost over.

Cobb, who is handling the White House's response to the Mueller probe, declined to comment to the Times. “We decline to comment out of respect for the Office of the Special Counsel and its process,” Cobb said.

Mueller recently found out about Trump’s attempt to have him fired, according to the Times, as his team has begun interviewing top current and former Trump officials.

The Times's bombshell report comes just a day after Trump said he would be willing to interview with Mueller.