In an interview on ABC's "This Week," Homeland Security Secretary Alejandro Mayorkas warned of a "very difficult threat landscape" after the New Orleans truck attack.

He said the Bourbon Street attack was part of "a significant increase in what we term homegrown violent extremism."

Sen. Josh Hawley (R-Mo.) is asking the Senate Homeland Security Committee to call on Homeland Security Secretary Alejandro Mayorkas and FBI director Christopher Wray to testify after the New

CNN ’s Wolf Blitzer on Thursday asked Homeland Security Secretary Alejandro Mayorkas about memos where his department reportedly warned law enforcement agencies of “lone offenders” and the potential use of vehicle ramming about a month before the New Year’s Day attack in New Orleans.

Homeland Security Secretary Alejandro Mayorkas argued it is “not fair” to say that the city of New Orleans ignored the bulletin on the risks of attacks by drivers plowing cars into crowds of people. “I don‘t think that‘s fair