Lewandowski: 'If Donald Trump runs, he will be the Republican nominee'
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Corey Lewandowski, President TrumpDonald TrumpTrump defends indicted GOP congressman House to vote Thursday on holding Bannon in contempt Youngkin calls for investigation into Loudoun County School Board amid sexual assault allegations MORE's former campaign manager, said there is no question his old boss will be the GOP nominee in 2020 if he seeks reelection.

Lewandowski was responding to remarks from Sen. Susan CollinsSusan Margaret CollinsEmanuel to take hot seat in Senate confirmation hearing Overnight Health Care — Presented by Carequest — FDA moves to sell hearing aids over-the-counter Rachel Levine sworn in as first openly transgender four-star officer in health corps MORE (R-Maine) on Monday, who said "it's too difficult to say" if Trump will be the party's presidential nominee in 2020.

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"I don't take any weight in the fact of what Sen. Collins said about Donald Trump being the nominee in 2020. If Donald Trump runs, he will be the Republican nominee, there's no question about that," Lewandowski said in an interview on Fox Business Network. 

In the interview, Lewandowski said it was difficult for Trump to move his legislative agenda because of a highly politicized environment. But he said critics are making a mistake if they are counting Trump out.

"It's very hard to get things done in this highly politicized environment, but you have to remember that when Donald Trump ran for office, many of the people, many of the pundits, many of the so-called experts said he would never run, he'd never be successful," Lewandowski said.