Hillary Clinton's campaign team hotly disputed Donald Trump's assertion President Obama "founded" the Islamic State, and fired back Thursday with a message characterizing the GOP nominee as a know-nothing blowhard.

"This is another example of Donald Trump trash-talking the United States. It goes without saying that this is a false claim from a presidential candidate with an aversion to the truth and an unprecedented lack of knowledge," Hillary for America senior policy adviser Jake Sullivan said in a statement.

"What's remarkable about Trump's comments is that once again, he's echoing the talking points of Putin and our adversaries to attack American leaders and American interests, while failing to offer any serious plans to confront terrorism or make this country more secure," he added.

Trump said at a campaign rally in Florida Wednesday evening that Obama "founded" the Islamic State, and that the marauding terrorist group "honors" the president.

"In many respects, you know, they honor President Obama," the Republican candidate told a crowd of supporters. "He's the founder of ISIS. He's the founder of ISIS. He's the founder. He founded ISIS."

"I would say the co-founder would be crooked Hillary Clinton," he added.

Later, in an interview Thursday morning with talk radio host Hugh Hewitt, Trump stuck to his assertion, and reiterated his claim the president founded the terrorist group.

Hewitt first offered Trump an out by saying, "Last night, you said the president was the founder of ISIS. I know what you meant. You meant that he created the vacuum, he lost the peace."

Trump would have none of it.

"No, I meant he's the founder of ISIS. I do," the GOP nominee said. "He was the most valuable player. I give him the most valuable player award. I give her, too, by the way, Hillary Clinton."

Hewitt interjected, "But he's not sympathetic to them. He hates them. He's trying to kill them."

"I don't care," Trump said. "He was the founder."

The GOP candidate said again in a separate interview Thursday morning on CNBC that Obama "founded" the Islamic State.

"He was the founder of ISIS, absolutely," Trump answered.

He continued, asking, "Why, is there something wrong with saying that? Are people complaining that I said he was the founder of ISIS?"

It's worth noting, however, that this is not a new talking point for Trump, and is, in fact, something that he has been saying for at least seven months.

At a campaign rally in Mississippi in January, Trump said, "They've created ISIS. Hillary Clinton created ISIS with Obama."

He said later in an interview in July, "Hillary Clinton invented ISIS with her stupid policies. She is responsible for ISIS."

In August, he said it again, telling a crowd at a rally, "It was Hillary Clinton — she should take an award from them as the founder of ISIS."