Peter Strzok came under fire from President Donald Trump and other Republicans
In March, Attorney General Jeff Sessions fired FBI Deputy Director Andrew McCabe after a scathing report by the Justice Department's internal watchdog concluded he had leaked information to reporters and misled investigators about his actions.
Comey was fired by Trump in May 2017 after Deputy Attorney General Rod Rosenstein helped write a memo that was critical of how Comey handled the FBI's probe into then-Secretary of State Hillary Clinton's use of a private email server for official business.
Later, however, Trump claimed he fired Comey over that "Russia thing," apparently referring to the FBI probe into whether his presidential campaign colluded with Russia. Trump has repeatedly denied any collusion and called the investigation a witch hunt.
Both Comey and McCabe said, however, they believe they were fired because they are key witnesses in Special Counsel Mueller's probe into whether Trump may have tried to obstruct the investigation.
Strzok was deeply involved in the FBI's Clinton email investigation and was temporarily assigned to Mueller's office. He was removed from that post after his texts came to light.
The texts were criticized by the Justice Department's inspector general in a recent report that examined the FBI's handling of the Clinton email probe. Republicans in Congress have repeatedly pointed to them as evidence the FBI is biased against Trump.
