President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE announced Friday that Bill Hagerty, who currently serves as ambassador to Japan, will run for the open Tennessee Senate seat next year to replace Sen. Lamar Alexander Andrew (Lamar) Lamar AlexanderGraham: GOP has votes to confirm Trump's Supreme Court nominee before the election The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy This week: Supreme Court fight over Ginsburg's seat upends Congress's agenda MORE (R).

“Tennessee loving Bill Hagerty, who was my Tennessee Victoy Chair and is now the very outstanding Ambassador to Japan, will be running for the U.S. Senate. He is strong on crime, borders & our 2nd A. Loves our Military & our Vets. Has my Complete & Total Endorsement!” Trump tweeted.

Tennessee loving Bill Hagerty, who was my Tennessee Victoy Chair and is now the very outstanding Ambassador to Japan, will be running for the U.S. Senate. He is strong on crime, borders & our 2nd A. Loves our Military & our Vets. Has my Complete & Total Endorsement! — Donald J. Trump (@realDonaldTrump) July 12, 2019

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Alexander, a 79-year-old three-term senator, announced in December that he will not run for reelection in 2020. His office did not immediately respond to a request for comment regarding Hagerty’s candidacy.

Sources familiar with the conversation told The Hill that Alexander and Sen. Marsha Blackburn Marsha BlackburnHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google Senate panel threatens subpoena for Google, Facebook and Twitter executives MORE (R-Tenn.) worked together with the White House and talked with the president and his closest advisers this week to encourage Hagerty's run.

Before serving overseas, Hagerty worked as director of presidential appointments for the 2016 Trump Presidential Transition Team, served on former President George H.W. Bush’s Council on Competitiveness and was commissioner for Tennessee’s Department of Economic and Community Development. He also worked for years in the private sector and co-founded a private equity investment firm.

As ambassador, he helped facilitate several high-profile White House trips to Japan, including Trump’s attendance at last month’s Group of 20 summit.

The announcement of his candidacy comes a day after two other prominent Tennessee Republicans, former Gov. Bill Haslam and Rep. Mark Green Mark GreenOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security House panel pulls Powell into partisan battles over pandemic GOP lawmakers want answers from Disney on Mulan, China MORE, declared they would not run to replace Alexander.

Hagerty will have to face orthopedic trauma surgeon Manny Sethi in the primary race for the GOP nomination. Rep. David Kustoff David Frank KustoffLobbying world Trump announces, endorses ambassador to Japan's Tennessee Senate bid GOP to launch discharge petition on anti-BDS measure MORE (R) and former Rep. Stephen Fincher Stephen Lee FincherTrump announces, endorses ambassador to Japan's Tennessee Senate bid Lamar Alexander's exit marks end of an era in evolving Tennessee Tensions on immigration erupt in the House GOP MORE (R) have also floated runs of their own.

The National Republican Senatorial Committee did not immediately respond to a request for comment from The Hill regarding Hagerty’s candidacy.

James Mackler, who ditched a run for the Senate last year, is the only Democrat thus far to officially declare his intention to fill Alexander’s seat.

The Cook Political Report, a nonpartisan election handicapper, rates the race as “Likely Republican.”

Trump won Tennessee by more than 26 points in 2016. In last year’s election to replace Sen. Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R), Blackburn defeated former Gov. Phil Bredesen (D) by nearly 11 points.