(Reuters) - U.S. Representative Duncan Hunter, a leading California conservative, said on Monday he would plead guilty to a federal charge of misusing campaign funds in a corruption case that could help Democrats gain his traditionally Republican seat.

FILE PHOTO: U.S. congressman Duncan Hunter (R-CA) arrives for a motions hearing in his upcoming campaign financing trial at federal court in San Diego, California, U.S. July 8, 2019. REUTERS/Mike Blake/File Photo

Hunter, 42, a U.S. Marine Corps combat veteran and early supporter of President Donald Trump, had insisted he was the victim of a politically motivated prosecution. He announced his plans to enter a guilty plea on Tuesday during a brief interview aired on a local television station.

Hunter also indicated, without saying so explicitly, that he would not seek re-election next year to the San Diego congressional seat he first won in 2008, succeeding his father and fellow Republican, Duncan Lee Hunter.

“I’m confident that the transition will be a good one. My office will remain open, I’ve got a great staff,” he said. “We’re going to pass it off to whoever takes the seat next year.”

Hunter and his wife, Margaret, were indicted in 2018 on charges of misappropriating $250,000 in campaign donations to pay for personal expenses, including their children’s private school tuition, lavish travel, expensive meals at restaurants, groceries and clothing.

Margaret Hunter pleaded guilty in June to conspiring to misuse campaign funds, and agreed to cooperate with prosecutors in the case.

Duncan Hunter’s TV appearance on Monday coincided with the posting of a notice of his scheduled change-of-plea hearing, set for 10 a.m. PST on Tuesday in U.S. District Court in San Diego. Details of the prospective plea agreement were not disclosed.

Hunter told KUSI-TV he agreed to plead guilty to a single count of “misuse of my own campaign funds” in a deal he said he accepted to avoid subjecting his family to the spectacle of a trial that was due to open on Jan. 22.

“It’s important not to have a public trial for three reasons, and those three reasons are my kids,” he said on camera, dressed in a suit and tie.

A defense lawyer, Paul Joseph Pfingst, told Reuters Hunter would plead guilty to a charge of “conspiracy to convert campaign funds to personal use,” a felony he said carries a maximum penalty of 5 years in prison. But he said prosecutors would recommend “significantly less than that.”

BOOST FOR DEMOCRATS?

The case is seen as giving a boost to Democrats’ bid to seize the traditionally Republican seat in California’s 50th Congressional District. His 2018 Democratic challenger, Ammar Campa-Najjar, a former Obama administration aide of Mexican and Palestinian heritage, lost his bid to unseat Hunter in last year’s race despite the incumbent’s indictment.

But the dynamics of a guilty plea would presumably play more to Democrats’ favor in 2020. The party already holds a big majority of California’s 53 U.S. House of Representatives seats.

Hunter appeared to have blamed his wife for misuse of campaign funds in a Fox News interview last year, saying he had given her power of attorney while he was deployed to Iraq in 2003, and that she oversaw his campaign finances.

On Monday, Hunter acknowledged: “I did make mistakes,” though he sought to draw a distinction between campaign funds and taxpayer dollars.

“Not a single dime in taxpayer money is involved in this,” he said. “I did not properly monitor or account for my own campaign money.”

Hunter said that if he were sentenced to prison, he was prepared to “take that hit,” adding: “My only hope is that the judge does not sentence my wife to jail. I think my kids need a mom at home.”

The six-term congressman also said he was most proud of his support for members of the U.S. armed forces who he believed were wrongly prosecuted for alleged battlefield misconduct. Among those was Navy SEAL Edward Gallagher, convicted by court-martial of illegally posing for photos with a dead Iraqi detainee before Trump granted him clemency.

Hunter served in Iraq and Afghanistan before becoming the first combat veteran of either conflict to serve in Congress.