The Obama campaign launched its latest attack ad Tuesday, linking Mitt Romney to Donald Trump’s “birther” comments and suggesting the presumptive Republican nominee is allowing “voices of extremism” to flourish in the party.

The video was released on the same day that Romney plans to hold a fundraiser in Las Vegas with Trump, who toyed with a run for president before backing off and eventually endorsing Romney.

The real estate mogul and reality TV star continues to raise questions about Obama’s birthplace, most recently bringing up spurious claims that he was born in Kenya.

Check out the Obama ad:

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