National security leaders are growing increasingly concerned about Iranians with ties to the Revolutionary Guard attempting to enter the United States illegally from Canada and harm Americans as the war overseas continues.

Homeland Security Secretary Markwayne Mullin disclosed this week that federal immigration authorities from U.S. Customs and Border Protection and Canadian police had begun to encounter Iranian nationals attempting to enter the U.S. illegally along its northern border, with the number of encounters increasing day by day. Mullin did not provide additional details.