Kyrsten Sinema, a former US senator from Arizona, had a romantic relationship with a member of her security detail that led to the breakup of the man’s marriage, his ex-wife alleges in a lawsuit seeking at least $75,000 from Sinema.

Matthew and Heather Ammel had “a good and loving marriage” with “genuine love and affection” before Sinema interfered, pursuing Matthew Ammel despite knowing he was married, Heather Ammel alleges in her lawsuit.

The Arizona lawmaker’s head of security hired Matthew Ammel after he retired from the army in 2022, according to the lawsuit, which says he accompanied her on travels to destinations including Napa Valley, California; Las Vegas and Saudi Arabia.

In early 2024, Ammel’s wife discovered “romantic and lascivious” messages he’d exchanged with Sinema over the Signal messaging app. That summer, he stopped wearing his wedding ring and Sinema gave him a job as a national security fellow in her Senate office while he continued to work for her campaign as a bodyguard, the lawsuit alleges.

Sinema also paid for psychedelic treatment for Ammel, who has struggled with post-traumatic stress, substance abuse and traumatic brain injuries tied to his military deployments in Afghanistan and the Middle East, according to the lawsuit.

Sinema and her attorney did not respond to requests for comment.

The lawsuit was quietly filed late last year in Moore County, North Carolina. This week, Sinema asked for the suit be moved from state court to federal court.

North Carolina is one of a handful of states that allow former spouses to sue for “alienation of affection” to seek damages from a third party responsible for the breakup of their marriage.

Sinema left Congress after the 2024 election. She declined to seek re-election to the Senate, capping a tumultuous single term in which she alienated liberals and left the Democratic party to become an independent.

She now works for the Washington-based legal and lobbying firm Hogan Lovells. She has lobbied for data center development and research funding for the psychedelic drug ibogaine.