At an Orange County, California campaign rally for Donald Trump, protesters opposing him clashed with riot police and taunted his supporters, leading to about 20 arrests, at least one injury and the vandalization of two police cars, reports The Washington Post.

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In anticipation of possible rioting and clashes between activists and police at the Republican National Convention this June, the host city of Cleveland, Ohio has spent $1.5 million on an insurance policy covering it for $10 million in damages,reports the Huffington Post.

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• WashExaminer: Republicans Split Between Denial and Acceptance on Trump
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After a five-state sweep of Republican primaries in the northeast, Donald Trump declared himself the presumptive Republican presidential nominee, and prepared himself to deliver his first major foreign policy speech, reports USA Today.

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• The Hill: Fears Grow About Rising US Troop Levels In Middle East