Left-wing activists in Utah compared the Republican hopeful to Adolf Hitler

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Hundreds of activists chanted "Dump Trump" and "Mr Hate out of our state" as riot police blocked the entrance to the rally in Salt Lake City last night.

Others waved banners reading "Trump is Hitler" and "Trump makes America hate again" before tearing down a security tent, according to media reports.

And some eyewitness claimed rocks were thrown at Trump supporters leaving the venue, the Infinity Event Centre, at around 9pm local time.