Donald Trump is expected to propose an ideological test that would determine whether visa applicants support American values before they are authorized to enter the U.S., according to multiple reports.

The Republican presidential nominee will deliver a speech on terrorism Monday afternoon as he looks to regain momentum following the worst two weeks yet for his campaign. Months after outlining his “America First” foreign policy vision, Trump is slated to expand on what he would do as president to protect the U.S. from existential threats and domestic terror strikes.