Republican presidential candidate Donald Trump addresses a gathering Monday during a campaign stop in Lowell, Mass.

MANCHESTER, N.H. — Republican presidential hopeful Donald Trump is giving some of the most divisive proposals of his campaign a starring role in his first television ad — although the billionaire developer faced questions about the footage he chose to illustrate his arguments.

With the opening 2016 primary contest four weeks away, Trump is spotlighting his plan to ban Muslims from entering the United States — temporarily and with exceptions, he says — and to build a wall along the southern border. Trump’s campaign says he plans to spend $2 million a week on the ad, set to begin airing today across Iowa and New Hampshire.

The new ad features dark images of the San Bernardino shooters, who were Muslims, as well as body bags and explosions.

“The politicians can pretend it’s something else. But Donald Trump calls it radical Islamic terrorism. 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,” a narrator says.

Video footage later in the ad shows people apparently streaming freely across a border as a narrator says Trump will “stop illegal immigrants by building a wall on our southern border that Mexico will pay for.”