McCabe has been in charge of the FBI since early May after former Director James Comey was fired by Trump.
The Justice Department's Office of the Inspector General said in January it was reviewing the FBI's handling of Hilary Clinton's use of a private email server, the reason the president dismissed Comey, according to a memorandum by Deputy Attorney General Rod Rosenstein.
In October, it was reported that a political action committee affiliated with Virginia Gov. Terry McAuliffe, who has ties to Hillary Clinton, donated nearly $500,000 to the losing campaign of McCabe's wife Jill McCabe during the 2015 Virginia state election.