"Stupid politicians" and lax immigration policies underlay the attack at Ohio State University in which a student rammed a campus crowd with his car and then slashed others with a knife, President-elect Donald Trump said tonight.

Trump spoke for 50 minutes before a crowd of thousands in U.S. Bank Arena in the first stop of his "USA Thank You Tour," with the Republican at one point talking of "radical Islamic terrorism."

Trump, who takes office 50 days from today, turned a couple of minutes later to the incident on Monday at Ohio State in which Abdul Razak Ali Artan, 18, injured 11 people before the Somalian immigrant was fatally shot by an OSU police officer.

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