Rudy Giuliani said Wednesday that Donald Trump's campaign shakeup only shows his campaign is growing.

"More people. The campaign is getting bigger and bigger and bigger. A lot of people think he has no organization. Good, I like them to think that," the former New York City mayor said on Fox News Wednesday. "The reality is I've traveled to a number of states with Donald and I've seen the organization he has."

Early Wednesday morning, Trump's campaign announced that Stephen Bannon from Brietbart News would be the new Trump campaign chief, and pollster Kellyanne Conway would be promoted to campaign manager.

Giuliani denied that the move was because people are upset at the way the current campaign is working under campaign chairman Paul Manafort.

"I think it's about management, making sure you have the right number of people in place to manage an organization that's grown dramatically," he said.

Giuliani reiterated that the campaign shakeup is "a good thing," and pushed back against criticism that it was made after Trump's poor July and August.

"This is what Ronald Reagain did when he brought Jim Baker in. ... It would be like him bringing Ted Cruz's campaign manager, and that thing that helped to turn the campaign around," Giuliani said.

According to Giuliani, Trump has had "two tremendous days."

"I mean, those two speeches were the two most substantive, I would say historic speeches that any presidential candidate has made in a very long time," Giuliani said, referring to Trump's speeches on Monday and Tuesday in Ohio and Wisconsin.