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Before every performance of “Allegiance” at the Longacre Theatre, the audience puzzles over an empty seat with a sign, “Reserved — Mr. Donald Trump.”

Turns out that the musical’s star, George Takei, has been holding open a seat for the presidential candidate since Dec. 10, when Trump called for a halt to all immigration of Muslims.

Your seat is ready for you, Mr. Trump pic.twitter.com/Pt75d14YfW — George Takei (@GeorgeTakei) December 25, 2015

Takei’s musical is about the internment of Japanese-Americans, including Takei and his family, during World War II that occurred, the actor says, “simply because we happened to look like the people that bombed Pearl Harbor.”

The two have been pals since Takei was on “Celebrity Apprentice” in 2012. “George was fired by Donald but he doesn’t hold it against him,” a spokesman for “Allegiance” told me.

Takei wants Trump to see “Allegiance” so “hopefully he can learn from it,” Takei said when he launched #TrumpWatch.

But Trump — given his campaign and travel schedule — hasn’t had time for the show.