RALEIGH, N.C. (AP) -- Former U.S. Sen. Kyrsten Sinema acknowledges having a romantic relationship with a member of her security detail that began while she was a lawmaker, according to legal documents. But she also contends she shouldn't be subject to a lawsuit by the man's ex-wife who blames Sinema for the marriage breakup. The North Carolina federal court litigation seeks financial damages from Sinema, who represented Arizona in the U.S. House and later the Senate for one term that ended early last year. Heather Ammel contends in a lawsuit that she and husband Matthew had "a good and loving marriage" and "genuine love and affection" existed between them before Sinema interfered, pursuing him despite knowing he was married.