Donald Trump on Monday proposed an ideological test for those seeking entrance into the U.S. as he warned that the threat of terrorist attacks from "immigrants and the children of immigrants" is on the rise.

Speaking in Youngstown, Ohio, in what his campaign billed a major foreign policy address, Trump proposed an "extreme vetting" system that he said would ensure that only those who are committed to America and its Constitution are allowed in.

"The Trump administration will establish clear principles governing all decisions made in regard to immigration, and we will be tough and we will be even extreme," the GOP presidential nominee said.

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