Paul, who ended his own presidential campaign last month, said he will keep his preference private, and noted that his home state is up for grabs between Donald TrumpDonald John TrumpHouse Democrat slams Donald Trump Jr. for ‘serious case of amnesia’ after testimony Skier Lindsey Vonn: I don’t want to represent Trump at Olympics Poll: 4 in 10 Republicans think senior Trump advisers had improper dealings with Russia MORE, Ted CruzRafael (Ted) Edward CruzDebbie Wasserman Schultz marks 10 years as breast cancer survivor Foreign agent registration is no magical shield against Russian propaganda Let Trump be Trump and he'll sail through 2020 MORE and Marco RubioMarco Antonio RubioRyan pledges 'entitlement reform' in 2018 Richard Gere welcomes lawmakers' words of support for Tibet Dem lawmaker gives McConnell's tax reform op-ed a failing grade MORE.
 
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“It hasn’t been polled very much. So I think it’s very uncertain who’s going to win,” he told CNN on Saturday. “I’m not going to endorse anybody in the race.”
 
“I’ll probably keep that private,” he added when asked whom he vote for.
 
Paul convinced party leaders to switch Kentucky from a primary to a caucus state so he could run for president and Senate simultaneously this year.
 
Paul repeatedly clashed with Rubio during the campaign over foreign policy. Paul argued that the United States had overextended its military in the past decade, while Rubio positioned himself as one of the more hawkish candidates.
 
Paul also battled with Cruz over libertarian voters. Tensions built between the two campaigns as Cruz swiped activists who had supported Paul’s father Ron Paul’s past presidential campaigns.
 
In January, Paul said the prospect of front-runner Trump becoming the party’s nominee was more worrisome because of his broad view of executive authority.
 
“I do worry a little bit more about Donald Trump,” he said at the time. “The main reason I do is that I believe he wants more power to come to him and ‘he’ll take care of us all’ if we just give him more power, but I’m from a limited government tradition.”