Washington, Jul 29 (IANS): Republican presidential nominee Donald Trump, after hearing speeches at the ongoing Democratic National Convention (DNC), said he wanted to "hit a number of those speakers so hard, their heads would spin".

The Republican nominee zoomed in on one speaker especially, though he did not mention his name, CNN reported.

"I was going to hit one guy in particular, a very little guy," Trump said on Thursday at a campaign rally in Davenport, Iowa.

"I was going to hit this guy so hard his head would spin, he wouldn't know what the hell happened," CNN quoted Trump as saying.

The real estate mogul said this individual "came out of nowhere" and said had worked with Trump in the past.

"He made deals with me. 'Will you help me with this? Would you make this deal and solve the problem?' I solved the problem," Trump said.

His campaign did not respond to a request asking to clarify who Trump was talking about, reports CNN.

Several speakers this week have gone after Trump at the convention in Philadelphia that started on Tuesday, including Michael Bloomberg.

The former New York City mayor made a surprise endorsement over the weekend for Hillary Clinton, and described Trump in his DNC speech on Wednesday night as a "dangerous demagogue".

Democratic vice presidential nominee Tim Kaine also targeted Trump, mocking the businessman's tendency to accentuate his promises with a plea of "believe me".