Presidential hopeful Donald Trump is set to speak at a rally in Fountain Hills at 11 a.m.

Protesters are blocking a main highway leading into the Phoenix suburb where Republican presidential front-runner Donald Trump is set to hold a campaign rally. The protesters parked their cars in the middle of the road Saturday, unfurling banners with anti-Trump slogans and chanting "Trump is hate." The disruption caused a lengthy traffic backup, and drivers honked their horns in frustration.

MCSO officials tell ABC15, at least three people have been arrested.

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