At least four people with law enforcement experience are under consideration by President Donald Trump to replace James Comey at the helm of the FBI, according to a White House official, including the congressman who led a two-year investigation of Hillary Clinton.

Representative Trey Gowdy, a South Carolina Republican and former federal prosecutor who led the Benghazi investigation, and Alice Fisher, assistant attorney general for the Justice Department’s criminal division for President George W. Bush are under consideration. Mike Rogers, a former Republican congressman from Michigan who led the House Intelligence panel, and former New York City police Commissioner Ray Kelly also are on the list, said the official, who spoke on condition of anonymity.

That list is likely to grow, the official said.

Trump once called Gowdy’s Benghazi hearings a “disaster,” suggesting they fell short of producing enough damaging evidence against Clinton for her tenure as secretary of state during a 2012 attack in Libya that led to four American deaths. Gowdy supported Senator Marco Rubio in the 2016 Republican primary elections before ultimately supporting Trump as the nominee.

Fisher, the former Bush administration lawyer, is a partner with Latham & Watkins in Washington and focuses on white-collar and international criminal cases, according to the firm’s website.

Rogers retired from Congress in 2015 after seven terms to pursue a career in talk radio. He advised the Trump presidential transition team on national security issues but was asked to leave at about the same time New Jersey Governor Chris Christie was removed as head of the transition.

Kelly, 75, is the first person from Trump’s native New York to rise from beat patrolman to police commissioner and was the longest-serving head of the nation’s largest police force, holding the post a total of 13 years.

He was appointed commissioner by Democratic Mayor David Dinkins and again by Republican Mayor Michael Bloomberg. In between, he gained experience leading federal law enforcement agencies under President Bill Clinton as commissioner of the U.S. Customs Service.