A former Republican frontrunner looking for a campaign rebound says President Obama is part of the reason for Donald Trump's popularity.

FOX's Jared Halpern has more from Washington:

Jeb Bush and a super pack supporting him are leveling fresh attacks on Donald Trump and the real estate mogul has noticed, making Bush a top target at recent campaign rally's...

(Trump) "He spent $59-million. I spent nothing right, nothing."

But Bush isn't shying away, telling NPR President Obama is partly responsible for the rise of a candidate like Donald Trump.

(Bush) "We're living in a divided country right now and we need political leaders rather than continuing to divide us as both President Obama and Donald Trump do to unite us."

The Bush campaign is also shifting resources, cancelling a planned ad-buy in both Iowa and South Carolina to add staff in New Hampshire.

In Washington, Jared Halpern, FOX News.