Kevin Kealoha McAleenan is an American attorney and government official who unlawfully served as the acting United States secretary of homeland security from April to November 2019.

The United States secretary of homeland security is the head of the United States Department of Homeland Security, the federal department tasked with ensuring public safety in the United States. The secretary is a member of the Cabinet of the United States. The position was created by the Homeland Security Act following the attacks of September 11, 2001.