WASHINGTON (AP) — FBI Director Kash Patel touted his leadership of the nation's premier federal law enforcement agency at a congressional hearing likely to be dominated by questions about the investigation into Charlie Kirk’s killing and the recent firings of senior FBI officials who have accused Patel of illegal political retribution.

The appearance Tuesday before the Senate Judiciary Committee represents the first oversight hearing of Patel's young but tumultuous tenure and provides a high-stakes platform for him to try to reassure skeptical Democrats that he is the right person for the job at a time of internal upheaval and mounting concerns about political violence inside the United States.

Patel rattled off a series of what he said were accomplishments of his first months on the job, including his efforts to fight violent crime and protect children. Nodding to criticism from Democrats, he closed his remarks by saying: “If you want to criticize my 16 years of service, please bring it on.”

Patel returned to the committee for the first time since his confirmation hearing in January, when he asserted that he would not pursue retribution as director. He'll face questions Tuesday about whether he did exactly that when the FBI last month fired five agents and senior officials in a purge that current and former officials say weakened morale and contributed to unease inside the nation's premier federal law enforcement agency.

Three of those officials sued last week in a federal complaint that says Patel knew the firings were likely illegal but carried them out anyway to protect his job. One of the officials helped oversee investigations into the Jan. 6 2021, riot at the U.S. Capitol, and another clashed with Justice Department leadership while serving as acting director in the early days of President Donald Trump's administration. The FBI has declined to comment on the lawsuit.

Republican lawmakers, who make up the majority in the committee, are expected to show solidarity for Patel, a close ally of Trump, and are likely to praise the director for his focus on violent crime and illegal immigration.

Sen. Chuck Grassley of Iowa, the committee’s Republican chairman, signaled his support for Patel at the outset of the hearing, praising the director for having “begun the important work of returning the FBI to its law enforcement mission.”

“It’s well understood that your predecessor left you an FBI infected with politics,” Grassley stated.

The panel's top Democrat, Sen. Dick Durbin of Illinois, described Patel as “arguably the most partisan FBI director ever.”

“Director Patel has already inflicted untold damage on the FBI, putting our national security and public safety at risk,” Durbin said.

Republicans are also likely to try to elicit from Patel fresh details about the investigation into Kirk's assassination at a Utah college campus last week, which authorities have said was carried out by a 22-year-old man who had grown more political in recent years and had ascribed to a “leftist ideology.”

Patel drew scrutiny when, hours after Kirk's killing, he posted on social media that “the subject” was in custody even though the shooting suspect remained on the loose and was not arrested until he turned himself in late the following night.

Patel has not explained that post but has pointed to his decision to authorize the release of photographs of the suspect, Tyler Robinson, while he was on the run as a key development that helped facilitate an arrest. A Fox News Channel journalist reported Saturday that Trump had told her that Patel and the FBI have “done a great job.”

Robinson is due to make his first court appearance in Utah. It's unclear whether he has an attorney, and his family has declined to comment.

Another line of questioning for Patel may involve Democratic concerns that he is politicizing the FBI through politically charged investigations, including into longstanding Trump grievances. Agents and prosecutors, for instance, have been seeking interviews and information as they reexamine aspects of the years-old FBI investigation into potential coordination between Russia and Trump's 2016 presidential campaign.

Patel has repeatedly said his predecessors at the FBI and Justice Department who investigated and prosecuted Trump were the ones who weaponized the institutions.