Ben Carson is taking off the gloves — and taking on Donald Trump.

The retired neurosurgeon and Republican 2016 presidential candidate has finally begun hitting Trump following a spate of recent polls showing him gaining ground on the brash real estate mogul.

First, Carson cracked wise about the idea of a Carson-Trump ticket. He said that wasn’t a bad idea, except for their differences on immigration policy.

“It sounds really cool, you know, ‘Let’s just round them all up and send them back,'” Carson said during an appearance at the Commonwealth Club of California on Tuesday. “People who say that have no idea what that would entail in terms of our legal system, the costs — forget about it. Plus, where you gonna send them? It’s a double whammy.”

Read the article “Ben Carson Stops Playing Nice with Donald Trump” on politico.com.