Kyrsten Sinema, a former U.S. senator from Arizona, has been accused of having an affair with Matthew Ammel, a bodyguard in her security detail. Matthew Ammel's ex-wife Heather Ammel made the allegation in a lawsuit, filed in North Carolina, and said the alleged affair led to the breakdown of their 14-year marriage in November 2024. Newsweek has outlined five of the major claims made in the lawsuit and reached out to Heather Ammel's attorneys and Sinema by email to comment on this story outside