"Temptation"

The Dominion ambassador to the Federation – a Changeling named Morag - sneaked aboard the Phoenix in order to torment the one Jem’Hadar officer aboard, Lieutenant Tarna’motlan. Conducting a test of his loyalty to Starfleet versus a loyalty to herself as a Founder, she forced the officer to kill a nurse in the medical bay. The ambassador was apprehended but had to be released due to diplomatic immunity, and despite being highly controversial, continued to serve as the Dominion ambassador.