President TrumpDonald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE is rooting on Sean SpicerSean Michael SpicerKellyanne Conway to leave White House at end of month Pro-Trump duo Diamond and Silk launch new program on Newsmax TV The Hill's 12:30 Report - Presented by Facebook - Supreme Court's unanimous decision on the Electoral College MORE for the first time as the former White House press secretary competes on "Dancing With the Stars."

Trump tweeted on Monday to his more than 65 million followers:

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Spicer, 48, joined the cast of the celebrity TV dance competition in August. The announcement that he would be one of the high-profile figures shaking a leg on the long-running ABC series stirred controversy, with "Dancing With the Stars" host Tom Bergeron saying he would have to "agree to disagree" about selecting political guests for the show. 

Although Trump applauded the casting choice when Spicer was named as a contestant — saying he "will do great" in a Twitter post — the commander in chief hadn't tweeted his support since the season began last month.

Spicer, a former Republican National Committee communications director, worked as White House press secretary for approximately seven months in 2017.