The authorities that I have under the Department of Homeland Security are broad and extensive and I plan to use every single one of them to make sure that we’re following the law," Homeland Security Secretary Kristi Noem said.

The Department of Homeland Security has started giving employees lie detector tests to find out who is leaking details about upcoming immigration raids. The polygraph tests have been taking place for about three weeks,

Four sources say the Department of Homeland Security has begun performing polygraph tests on employees to determine who might be leaking information to the media about immigration operations. NBC News’ Jonathan Allen breaks down how the DHS is performing these tests.