Former President Donald Trump, after boasting about an “aced” cognitive test, said he endorsed “J.D. Mandel” at a Save America rally on Sunday in Nebraska in an apparent reference to Ohio candidate J.D. Vance. The blunder came after he also made fun of President Joe Biden stumbling over a word in a video clip. The former president was listing candidates he is supporting when he made the gaffe. “You know, we’ve endorsed Dr. Oz, we’ve endorsed JP, right? JD Mandel, and he’s doing great. They’re all doing good,” Trump told the crowd at the I-80 Speedway in Greenwood. Vance is running for the Republican Senate nomination in Ohio against Josh Mandel and Mike Gibbons in Tuesday’s primary. The error came after Trump called for Biden to undergo cognitive testing and bragged about his own perfect results. “Once and for all, Joe Biden should put the question to rest by taking a cognitive test … releasing the results for the entire world to see,” Trump said. (The Gabber)