McCabe plans to retire in about 90 days, when he becomes fully eligible for pension benefits, The Washington Post reported Saturday, citing people familiar with the situation.
McCabe, 49, is the No. 2 official in the Federal Bureau of Investigation and had been acting director after Trump fired the former director, James Comey, in May.
The president repeated false statements about McCabe's wife and donations she received during a 2015 campaign for Virginia state senate.
He was, the Post added, former FBI Director "James B. Comey's right-hand man, a position that involved him in most of the FBI's actions that vex President Trump and in the investigation of Hillary Clinton's use of a private email server while secretary of state, a matter that still riles Democrats".
An FBI spokesperson declined to comment.
The Republican-led House Judiciary and Oversight committees announced in October they were launching new investigations into a number of long-standing political grievances, including concerns over the FBI's handling of the Clinton email investigation.More news: Miss America CEO resigns over email scandal
Every time Democrats call up key members of the Trump administration or Trump transition team to Capitol Hill to testify in the ongoing Russian Federation investigation, there may be an underlying hope that it generates headlines that can only be beneficial for them going into 2018. The official confirmed, however, that McCabe would be able to retire with benefits in March.
Trump in June nominated Christopher Wray to replace Comey, who he fired in May. "90 days to go?!" Trump tweeted this month that the FBI's reputation "is in Tatters".
The reports about McCabe's plans, by the Post and the New York Times, come during an especially politically-charged and tense time in the FBI's relationship with the president and Republicans in Congress.
Watters, who filled in for Laura Ingraham on Friday's broadcast of The Ingraham Angle on Fox News, said Mueller's Russian Federation probe is the only thing that could hinder President Trump's re-election prospects in 2020.
Democrats accuse the GOP of diversionary tactics and say their criticism could embolden Trump to take steps to fire Mueller.
"It seems like Mueller's basically the Democrat candidate for president", Watters said.