After FBI Director James Comey, who provided inaccurate information last week about Hillary Clinton's emails to Congress was fired, Andrew McCabe has been appointed as the acting director, while a permanent replacement is yet to come in.  

“By operation of law and effective immediately, Deputy Director Andrew McCabe assumed the position of Acting Director of the FBI,” Attorney General Jeff Sessions said in a memo to FBI employees obtained by CNN. McCabe was appointed to the deputy director position in January 2016 by Comey, according to a FBI press release. "As deputy director, Mr. McCabe will oversee all FBI domestic and international investigative and intelligence activities and will serve as acting director in the director’s absence." 

Read: James Comey Called His Termination 'Fairly Funny Prank' Before Receiving Letter

Among McCabe's investigative projects, one was probing the sensitive inquiry into Clinton's use of a private email server. “My focus is on the inside [of the FBI] and all the work we do that is not talked about in the newspaper, on CNN, on the Hill,” he had told the Los Angeles Times in May 2016. 

McCabe has reportedly been under scrutiny from Republicans for his role in the investigations into the Clinton email server and Russian meddling in 2016 election. Questions around him were raised after it was revealed Clinton ally and Virginia Gov. Terry McAuliffe made a donation to his wife, Jill MacCabe's 2015 Senate campaign.

In October 2016, the Wall Street Journal reported a story about McAuliffe, who has longstanding ties with the Clintons, giving nearly $500,000 to the election campaign of Jill McCabe when she was running for the post of Senator. 

The House Oversight Committee Chairman Jason Chaffetz, a Utah Republican, sent a letter to Andrew McCabe questioning him about his wife's links with Clinton allies, including McAuliffe. 

In the letter, he wrote: "News accounts have raised questions about a potential conflict of interest related to donations from the political action committee of Virginia Governor Terry McAuliffe, a longtime fundraiser for the Clintons, to the state Senate campaign of your wife, Dr. Jill McCabe.”

"According to reports Governor McAuliffe and others met with you and your wife on March 7, 2015, five days after it was publicly revealed that Secretary Clinton used a personal email account to conduct government business as secretary of state."

Currently, McCabe is under investigation by the FBI’s inspector general for his involvement in the Clinton email investigation, according to Fox News.

McCabe has often faced scrutiny for his family ties with the Clintons. He did not list his wife's 2015 donations or his wife's salary in financial disclosures — although, such disclosure was not required, Fox News reported.

In a letter, in March, Sen. Charles Grassley, a Republican from Iowa  asked Comey for a detailed description on the involvement of McCabe in the investigation of Russian ties to Trump associates.

Grassley sent a letter again dated May 2 to Deputy Attorney General Rod Rosenstein, asking for a rigorous investigation on McCabe.