Ben Carson says Donald Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE should read the Bible.

"I would say read the Bible and pray, and learn how to put yourself in other people's shoes," Carson said when asked what advice he'd offer Trump in an interview with Rita Cosby on WABC Radio Friday.

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Carson said there are weaknesses in Trump's campaign that needed to be fixed.

"For him, it's a matter of just switching over to his normal persona as opposed to the Apprentice persona," he said, referring to the reality TV show Trump hosted for 11 years.

Carson ended his own presidential bid in early March and endorsed Trump. But that hasn't kept him from raising concerns about the GOP front-runner.

Just this week he said there are "probably" better people to fill the White House and said Trump's Twitter habits were a "problem."