"Schmidt wrote in his newsletter, The Warning with Steve Schmidt, words of advice for Harris' "showdown" with Baier, whom he called a "preposterous figure."
He said the Democratic presidential nominee must speak to the public "about the threat the whole country faces from Donald Trump and his fascist movement."
Harris' interview with Fox News will be her first with the outlet that many people contend gives favorable coverage to Trump, her Republican opponent in the upcoming presidential election.
The interview is scheduled to air at 6 p.m. Wednesday."
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Schmidt suggested that the Democratic nominee should embody former President Ronald Reagan in her interview while speaking "with firmness, strength, clarity and conviction about what Trump is, and the danger he represents."
"Tonight, Kamala Harris should look Bret Baier in the eye, and seize Ronald Reagan's mantle," Schmidt wrote.
"She should attack Trump as weak, immoral and degenerate. She should mock him as a laughing stock, and then quote the inscription on Ronald Reagan's grave."
Reagan's grave, which is in Bel Air, California, has a backdrop ensconcing the former president's tomb stone. It reads:
"I know in my heart that man is good that what is right will always eventually triumph and there is purpose and worth to each and every life."