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Bush steps up attacks on Trump

Republican presidential candidates Jeb Bush and Donald Trump have been feuding for weeks, but now Bush is launching his most aggressive attack yet.

One day after Trump mocked Bush for calling immigration "an act of love," Bush released a video that questions Trump's conservatism, and he used the billionaire's own words to do it, reports CBS News national correspondent Chip Reid.

Donald Trump launches new Twitter tirade 02:52

"I'm very pro-choice," Trump says in the video.

The video highlights less-than conservative statements Trump has made in the past.

"You'd be shocked if I said that in many cases I probably identify more as a Democrat," Trump says.

The short clip also shows the businessman-turned-politician praising Democratic frontrunner Hillary Clinton.

"Hillary Clinton, I think, is a terrific woman," Trump is seen saying.

"The Donald" fired back, first with a tweet.

Yet another weak hit by a candidate with a failing campaign. Will Jeb sink as low in the polls as the others who have gone after me?

— Donald J. Trump (@realDonaldTrump) September 1, 2015

While speaking to reporters in Miami, Bush didn't back down.

"If you look at his record of what he believes, he supports Democrats," Bush said.

That afternoon, Trump rolled out a video of his own, showing the former Florida governor himself honoring Clinton.

And the billionaire was on the defense again Tuesday night.

Bush, Trump trade fiery remarks 04:47

"At one point I was a Democrat; and for a period of time, and over the years, as Ronald Reagan changed, I also changed. I became much more conservative. I also became a Republican," he said.

While Bush and Trump continue to trade jabs, for now, it seems the other candidates are staying out of this fight.

Attacking Trump could be risky for Bush, and it comes amid with his popularity slipping. A poll out this week shows Trump tied with Ben Carson for the lead among Iowa Republicans. Bush is in fifth place.

But it could also reap big rewards. If Trump does in fact implode, Bush could come out looking like the guy who had the courage to take him on.

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