Five Republican senators have already announced they are retiring, creating a handful of open GOP seats with competitive primaries.

Sen. Ron Johnson hasn’t decided whether he will run for reelection next year, but he already has the most powerful endorsement in Republican politics: former President Donald Trump’s.

Johnson, who was first elected in the 2010 Republican wave and won a closely contested reelection in 2016, has not said whether he will seek a third term and has emphasized multiple times in recent months that he plans to take his time making the decision. But Trump gave him his backing in a statement released through his leadership PAC, Save America PAC, on Thursday.

“Even though he has not yet announced that he is running, and I certainly hope he does, I am giving my Complete and Total Endorsement to Senator Ron Johnson of Wisconsin,” Trump said in the statement. “He is brave, he is bold, he loves our Country, our Military, and our Vets. He will protect our Second Amendment, and everything else we stand for. It is the kind of courage we need in the U.S. Senate.”

“He has no idea how popular he is,” Trump added. “Run, Ron, Run!”

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