Donald TrumpDonald John TrumpNew Bob Woodward book will include details of 25 personal letters between Trump and Kim Jong Un On The Money: Pelosi, Mnuchin talk but make no progress on ending stalemate | Trump grabs 'third rail' of politics with payroll tax pause | Trump uses racist tropes to pitch fair housing repeal to 'suburban housewife' Biden commemorates anniversary of Charlottesville 'Unite the Right' rally: 'We are in a battle for the soul of our nation' MORE’s former campaign manager says the billionaire has four names left on his shortlist for the vice presidency.

“The list when I left was very, very short,” Corey Lewandowski said Thursday on CNN’s “OutFront." "It’s no more than four individuals right now.

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“These are people everybody will know. They are household names. People will be very, very happy when he decides on one of these individuals.”

Lewandowski added all four contenders are qualified running mates who are enthusiastic about the position.

“The individuals he has talked to about that process has said they want to be a part of that process,” he said. “These individuals who are of the highest quality, who are ready and able to serve. They’d be ready to go on day one. There’s no on-the-job training here. They will help him achieve his legislative agenda.”

Lewandowski, who was debuting as a CNN political commentator after being fired by the Trump campaign, did not reveal any names Trump is considering.

Lewandowski reportedly battled with campaign chairman Paul Manafort, troubling Trump’s family and other campaign staff.

Lewandowski on Thursday vowed he would offer unvarnished opinions of the Trump campaign as a media personality.

“I’m a guy who calls balls and strikes,” he said. "I’m going to tell you how it is. That’s been to my detriment at some points in my career. There’s nothing that’s going to stop me from telling the truth.”

Lewandowski added he remains grateful for his role transforming Trump into the presumptive GOP presidential nominee.

“I feel honored about being part of changing the American political system for the rest of our lives and going forward," he said.