Former President Donald Trump will reportedly blacklist anyone who works for Florida Governor Ron DeSantis as part of an effort to stop the governor from running for president.

The blacklist, which was first reported on by the right-of-center publication RealClearPolitics, will extend to anyone who has worked on tour to promote the governor’s new #1 bestselling book “The Courage to Be Free: Florida’s Blueprint for America’s Revival” or who works on a potential presidential campaign for the governor.

“It’s a time for choosing,” a source close to Trump told the publication. “If you work for Ron DeSantis’ presidential race, you will not work for the Trump campaign or in the Trump White House.”

If Trump were to win the presidency again he would have significant power over the national Republican Party and could try to enforce the same blacklist there.

A prominent conservative grassroots organizer, who spoke on the condition of anonymity, warned against Trump’s “loyalty test,” saying, “It’s the American people who will ultimately decide who is the next president and many grassroots see through these desperate pleas for allegiance and instead wish there was a substantive debate about the future of our great country.”