Former Notre Dame football coach Lou Holtz on Monday endorsed Republican presidential front-runner 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.

"I wholeheartedly endorse Donald Trump as the next president of the United States. There are nothing but winners in Indiana," Holtz said in a video posted on Twitter.

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"The main reason I'm endorsing him: I've played his golf course, I've stayed in his hotel. He does nothing but go first class in everything. He wants this country to be first class as well."

Trump tweeted out the video and thanks Holtz for his support.

"Honored to have received the endorsement of Lou Holtz — a great guy!" Trump tweeted.

Honored to have received the endorsement of Lou Holtz - a great guy! #INPrimary #Trump2016 pic.twitter.com/AeGyODb37O — Donald J. Trump (@realDonaldTrump) May 2, 2016

The endorsement comes ahead of the Indiana primary on Tuesday, where Trump is polling ahead of his two competitors. According to the RealClearPolitics average of polls, Trump has a 9.3-point lead over rival Ted Cruz Rafael (Ted) Edward CruzSenate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week Renewed focus on Trump's Supreme Court list after Ginsburg's death MORE.

It's not the first high-profile endorsment from a sports figure in the state. Trump was also endorsed by former Indiana University basketball coach Bobby Knight.