As Kash Patel, President Donald Trump’s pick to lead the FBI, appears Thursday for his Senate confirmation hearing, some of the rhetoric he has espoused for years to defend Trump and promote Trump’s reelection is sure to elicit sharp questions about whether he is fit to lead one of the nation’s premiere law enforcement agencies.

Patel has derided the FBI as the “Federal Bureau of Insanity.” He’s announced “a mission to annihilate the ‘Deep State'” — what he calls a “cabal of unelected tyrants” inside government, undermining Trump. He’s said the conspiracy theory QAnon, claiming a secret global plot to traffic children and take down Trump, is right in many ways and “should get credit for all the things” it has accomplished. And he once promised to “come after” and prosecute “the conspirators not just in government, but in the media” who “helped Joe Biden rig the presidential election” in 2020.

On a podcast two years ago, Trump adviser Roger Stone told Patel his critics are right about one thing: “You are a Trump loyalist.”

Patel chuckled and nodded affirmatively.

But that’s just what Democrats — and even some Republicans — on the Senate Judiciary Committee may wonder about most: If confirmed, is Patel so loyal to Trump that he would use the FBI to push Trump’s political agenda and target Trump’s perceived enemies?

‘An existential threat’

According to Patel, the FBI has already become a political weapon — especially with its multiple investigations of Trump, including the unprecedented search of Trump’s Mar-a-Lago estate in 2022 — and that’s what he wants to change.

“The rot at the core of the FBI isn’t just scandalous, it’s an existential threat to our republican form of government,” Patel wrote in his book, published two years ago, titled “Government Gangsters.”

Trump, on social media, called Patel’s book “the roadmap to end the Deep State’s reign” when it came out.

Many of Trump’s allies in Congress have lauded Patel’s nomination, touting him as the change agent needed at the top of an embattled agency. Judiciary Chairman Chuck Grassley, R-Iowa, has called Patel’s career “a study in fighting for unpopular but righteous causes, exposing corruption, and putting America First.”

Democrats, however, not only point to what they see as Patel’s concerning rhetoric — but also what they’ve described as his relative lack of experience for such a significant position.

After meeting with Patel last week, the top Democrat on the Judiciary Committee, Sen. Dick Durbin, D-Ill., said he has “grave concerns” about Patel’s nomination, declaring, “Mr. Patel has neither the experience, the temperament, nor the judgment to lead the Federal Bureau of Investigation.”

‘I just got to my breaking point’

Now in his mid-40s, Patel grew up on New York’s Long Island, ultimately deciding to attend law school after caddying for a group of criminal defense attorneys at the Garden City County Club. By his own account, in 2005, he graduated from Pace University Law school in the bottom third of his class — something he was “very proud of,” he once joked.

After law school, he spent nine years as a public defender, and in late 2013 he moved to Washington, D.C., to join the Justice Department’s National Security Division as a terrorism prosecutor, helping U.S. attorneys’ offices around the country prosecute their cases.

He was involved in Justice Department cases all over the world, including ones stemming from the 2012 attack on the U.S. mission in Benghazi and the 2010 World Cup bombings in Uganda.

But in his book and in media interviews, he said he grew frustrated with his time at the Justice Department, especially after a dust-up with a federal judge that made national headlines.

In early 2016, while Patel was in Tajikistan for work, the judge presiding over one of his cases in Texas called for an in-person hearing back in the United States. Patel didn’t have a suit or tie with him in Tajikistan, and after racing halfway around the world to make the hearing, the judge badgered him to “dress like a lawyer” and “act like a lawyer,” according to a transcript of the exchange.

“You don’t add a bit of value, do you?” the judge added.

As Patel recounted in his book, his bosses at the Justice Department privately expressed support for him, but when the Washington Post wrote a story about it two weeks later, the Justice Department, in Patel’s telling, refused to defend him publicly, so the newspaper “dragged my name through the mud.”

Patel has also described how he grew upset over the Justice Department’s handling of the Benghazi case following the 2012 attack by Islamic militants, believing that “terrorists went free” despite his disputed assertion that the Obama administration had enough evidence to charge even more people for the attack.

“I just got to my breaking point,” Patel once recalled. So in 2017, he left the Justice Department to become a senior investigator on Capitol Hill, where he helped lead the House Republicans’ probe of “Russiagate” — which, as he describes it, exposed FBI wrongdoing in its 2016 investigation of alleged ties between Trump’s presidential campaign and Russia.

‘Not a credible witness’

Patel’s work on the Russia probe led to him joining the Trump administration in 2019, and in the final year of Trump’s presidency he was appointed acting deputy director of national intelligence — the second-in-command of the entire U.S. intelligence community — and then chief of staff to the acting U.S. defense secretary, a position that critics claimed he was unqualified to hold even for just the 10 weeks he was there.

After Trump’s first administration ended, Patel regularly appeared on conservative media outlets, frequently praising Trump and criticizing the Justice Department for investigating and then prosecuting Trump for his alleged mishandling of classified documents after leaving office and his alleged efforts to overturn the 2020 presidential election.

Patel has claimed — despite the Justice Department’s inspector general finding otherwise — that the FBI played a part in pushing pro-Trump protesters to attack the U.S. Capitol on Jan. 6, 2021. And he has claimed in media interviews and court testimony that Washington, D.C., Mayor Muriel Bowser and then-House Speaker Nancy Pelosi deserve blame for the attack — not Trump — because, Patel insists, Trump days earlier had authorized up to 20,000 National Guard to secure the Capitol.

The judge who listened to his court testimony in a case about Trump’s eligibility to be on Colorado’s ballot in the November election ruled that Patel “was not a credible witness,” saying his testimony was “not only illogical” but “completely devoid of any evidence in the record.”

After Trump left office, Patel launched a tax-exempt charity, now known as the Kash Foundation, which made national headlines in 2023 with revelations that it provided thousands of dollars to at least two so-called “FBI whistleblowers” who helped House Republicans push disputed claims of corruption inside the Justice Department.

Patel has said his charity helps fund defamation lawsuits, supports whistleblowers, buys meals for families in need over Christmas, supports Jan. 6 families, and more recently funds “rescue operations” out of Israel.

But he has refused to offer specifics about who is benefiting from his charity, and, as ABC News previously reported, experts have questioned whether it was following the law. At the time, Patel declined to speak with ABC News about its reporting.

After Trump announced his latest presidential campaign, Patel traveled the country to promote Trump’s reelection, saying that Trump would fire “thousands and thousands and thousands” of government employees to root out the “Deep State.”

Three weeks after Trump was reelected president, he named Patel as his pick to lead the FBI.