Republican presidential front-runner Donald Trump focuses on the threat from the Islamic State in Iraq and Syria (ISIS) in his first television ad, released early Monday.

"The politicians can pretend it's something else, but Donald Trump calls it radical Islamic terrorism," a narrator says over images of the San Bernardino, Calif., shooters.

"That's why he's calling for a temporary shutdown of Muslims entering the United States until we can figure out what's going on."

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