Trump called McCabe out for accepting hundreds of thousands of Hillary Clinton fundraising dollars spent on McCabe’s wife during her race for the Virginia State Senate in 2015. McCabe later player a prominent role in the investigation of Hillary Clinton over the summer for her private email server debacle, which resulted in no charges being filed. McCabe only recused himself when it became public that there was a financial connection between himself and the Clintons.

“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?” Trump tweeted.

According to those close to the situation, apparently McCabe is basically sitting around waiting a couple months in order to retire with full benefits, much to annoyance of Trump.
Iowa Sen. Chuck Grassley recently called for McCabe’s removal, saying he  “ought to go for reasons of being involved in some of the things that took place in the previous administration. We want to make sure that there’s not undue political influence within the FBI.”