DES MOINES, Iowa (AP) — President Donald Trump is trying to shore up support from constituencies that not so long ago he thought he had in the bag: big business and voters in the red state of Iowa. Trump on Wednesday expressed puzzlement in an address to business leaders that they would even consider supporting his Democratic challenger, Joe Biden.

At a rally later Wednesday in Des Moines, Iowa, Trump claimed to be leading in the most recent poll he saw. But he said, “For me to only be up six, I’m a little bit concerned.” Multiple shows have shown a much closer race. Biden had no public campaign events scheduled Wednesday.

President Donald Trump says he doesn’t mind running against former Vice President Joe Biden, but he wouldn’t want to run against his Supreme Court nominee, Amy Coney Barrett. Speaking to supporters in Iowa on Wednesday, Trump got some of his biggest cheers when he brought up her confirmation hearings before the Senate Judiciary Committee. He joked, “Please promise me, Amy, you’ll never run.”

Trump calls Barrett a “great intellect” who is deftly handling the questioning she is getting, particularly from Democrats, and “she handles it like nothing.” Trump says he hasn’t spoken with Barrett for a few days, “and I just want to say we made the right choice with Amy.” If Barrett is confirmed, which is expected, she would replace liberal Justice Ruth Bader Ginsburg, who died last month.