Sen. Alexander endorses Rubio: 'The stakes are high'
© Getty Images

Sen. Lamar AlexanderAndrew (Lamar) Lamar AlexanderWeek ahead: Lawmakers near deal on children's health funding Ryan suggests room for bipartisanship on ObamaCare Time to end fiscal year foolishness MORE (R-Tenn.) is endorsing Marco RubioMarco Antonio RubioOvernight Cybersecurity: Bipartisan bill aims to deter election interference | Russian hackers target Senate | House Intel panel subpoenas Bannon | DHS giving 'active defense' cyber tools to private sector Senators unveil bipartisan push to deter future election interference Puerto Rico's children need recovery funds MORE’s White House bid, the Florida senator's campaign announced early Sunday.

"Marco Rubio is the conservative candidate who can inspire us, win the election, and lead our country," Alexander said in a statement. "The stakes are high. If our nominee does not win, Hillary ClintonHillary Diane Rodham ClintonIntel Dem decries White House 'gag order' after Bannon testimony 'Total free-for-all' as Bannon clashes with Intel members Mellman: On Political Authenticity (Part 2) MORE’s justices will control the Supreme Court for 30 years and we’ll be stuck with Obamacare forever.

"I have watched Marco up close. I have seen him take the lead in passing new laws to impose tough new sanctions on Hezbollah terrorists, and to get rid of incompetent managers who weren’t doing their jobs to help veterans. He has proposed good new ideas for giving students more options for college. I am convinced he would be a strong and effective president of the United States," he added.

Alexander’s endorsement comes ahead of the Tennessee GOP primary on Super Tuesday.

Tennessee’s Republican governor, Bill Haslam, endorsed Rubio last week.

The Tennessean reported that Alexander and Haslam are scheduled to join Rubio on Monday morning in Knoxville for a campaign event.