The president repeated false statements about McCabe's wife and donations she received during a 2015 campaign for Virginia state senate.
@realDonaldTrump: How can FBI Deputy Director Andrew McCabe, the man in charge, along with leakin' James Comey, of the Phony Hillary Clinton investigation (including her 33,000 illegally deleted emails) be given $700,000 for wife's campaign by Clinton Puppets during investigation?
Virginia Gov. Terry McAuliffe, a close friend of Hillary Clinton, donated almost half a million dollars to Jill McCabe through his political organization. Later, Andrew McCabe would help oversee the Clinton email investigation.
Trump also tweeted about reports that the deputy FBI director intends to retire in early 2018.
@realDonaldTrump: FBI Deputy Director Andrew McCabe is racing the clock to retire with full benefits. 90 days to go?!!!
The president's remarks come after The Washington Post reported, citing people familiar with the matter, that McCabe plans to retire after he becomes fully eligible for pension benefits.
A Justice Department official told NBC News that there McCabe has not formally notified the agency of his intent to retire. The official confirmed, however, that McCabe would be able to retire with benefits in March. The person said the FBI director is not required to indicate his intention to retire this early.
On Thursday, McCabe sat down for a transcribed interview with two House committees investigating the bureau's handling of the Clinton email investigation last year.
The White House did not immediately respond to CNBC's request for comment.
— NBC News, Reuters and CNBC's Tucker Higgins contributed to this report.