From The National Review:

Representative Steve King and Senators Ted Cruz and Chuck Grassley have reintroduced the Expatriate Terrorist Act, a bill to strip U.S. citizenship from terrorists. The proposal sounds nice in theory, but it is also unconstitutional and unnecessary, the latest in a sad line of civil-liberties infringements justified by politicians trying to look tough in the war on terrorism. Even if the bill did not have these fatal infirmities, it would put the determination of who will retain their citizenship in the hands of unelected bureaucrats at the Departments of Justice, State, and Homeland Security. On that ground alone, all Americans should unite in opposition.