Former Donald Trump campaign manager Corey Lewandowski argued Wednesday that the overnight news about the campaign's leadership shake-up is a "clear indication" that Trump "wants to win" in November and will do so at "all costs" with less than three months until election day.

Lewandowski was reacting to the hiring of Stephen Bannon, the campaign's newly-minted chief executive and the head of Breitbart News, and the promotion of Kellyanne Conway, a GOP pollster who is now the campaign manager for the final 82 days of the campaign.

"You've got a candidate that wants to win. This is a clear indication of that. If you look at Stephen Bannon and what they've built at Breitbart, it's win at all cost, and I really think that makes people on the left very afraid because they are willing to say and do things that others in the mainstream media wouldn't do," Lewandowski said on CNN.

"They've attacked the mainstream media on multiple occasions, and so what they are willing to say and do, I think right now, is the type of minds that the campaign wants to prove to the Clinton people that they're going to take the fight directly to her and that's what he's going to bring to the campaign," he added.

Lewandowski stressed the importance of Conway for the campaign, who had previously worked for a super political action committee supporting Sen. Ted Cruz, and also worked as a pollster for Indiana Gov. Mike Pence. He said she should be at Trump's side for the final stretch run "as often as possible," and said she brings "a sense of calmness" to the GOP nominee and the campaign.

"It is very important that Kellyanne is with him as often as possible," Lewandowski said. "No. 1, it's a woman and he needs a high-profile woman in a senior role there that he can listen to and understand what the gender gap is right now. She's going to help with that. She's an excellent person when it comes to message development. She's done this for a long time."

"She also brings a sense of calmness to Donald Trump. She understands that when things are fired up, she has this calming effect on him and it allows him to manage and message him in a way that he wants to do it that he's comfortable with," he continued. "Not trying to tell him what to say, but highlighting some of the message points that are going to resonate better with specific audiences he's going to talk to. So her being on the plane is something I think that has been lacking, which is that senior leadership on the plane, for the last two months."

"He wants people around him that will win at all costs," he added.

The moves also diminishes Paul Manafort's role as the campaign chairman and comes in the wake of a string of poor polls nationally and in key battleground states, some of which now have him down double digits.

Manafort reportedly had been trying to help Trump make the pivot from the primary campaign to the general election by moderating his pitch to voters, which has not worked overall, especially since the Republican National Convention. In that time, Trump openly feuded with Muslim-American Gold Star parents and high-ranking Republicans, including Speaker Paul Ryan, before ultimately backing him in his re-election campaign.