Donald TrumpDonald John TrumpA better VA, with mental health services, is essential for America's veterans Pelosi, Nadler tangle on impeachment, contempt vote Trump arrives in Japan to kick off 4-day state visit MORE's former campaign manager says the exit of the campaign's top figure shows how serious Trump is about winning the presidency.

Corey Lewandowski on Friday said that Paul Manafort's resignation illustrates that the Republican nominee will do anything he can to get his campaign on track and win.

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"This is a step the campaign has taken to continue to demonstrate how serious they are, that they are moving forward, that it is ready for the next 81 days," Lewandowski told CNN. 

"I think what you'll find is this campaign is squarely focused now on attacking Hillary ClintonHillary Diane Rodham ClintonHillary Clinton slams Trump for spreading 'sexist trash' about Pelosi Gillibrand seizes on abortion debate to jump-start campaign DNC boss says candidates to be involved in debate lottery MORE, on laying out their plan to make America great again to the American public." 

Lewandowski was fired from the campaign in June after reportedly clashing with Manafort on the campaign's approach. But he said Friday that he had nothing to do with Manafort's exit.

"People think I won. I had nothing to do with this. This is about Donald Trump. He's running for president. This is about what's best for Donald Trump, what is best for the American people." 

Lewandowski added that he wishes Manafort the "absolute very best." 

"He's a true professional," Lewandowski said. "I know how thankful I was to be able to work next to him as he worked to secure the delegates needed and to execute a convention." 

Manafort's resignation comes two days after Trump brought in Stephen Bannon as campaign chief executive and Kellyanne Conway as campaign manager in a major shakeup. 

The moves were seen as a de facto demotion for Manafort, even though the campaign stressed that he was keeping his position at the time.

“I am very appreciative for his great work in helping to get us where we are today, and in particular his work guiding us through the delegate and convention process," Trump said in a statement Friday.

"Paul is a true professional and I wish him the greatest success.”