Taliban officials late Thursday rejected a suggestion by President Trump that the United States might regain control of the last major base it abandoned during its withdrawal from Afghanistan, but they left open the possibility of talks to improve ties between the two countries. During a news conference on Thursday with Prime Minister Keir Starmer of Britain, Mr. Trump said that his administration had been working to reclaim the facility, the Bagram Air Base outside Kabul, which U.S. forces abandoned in 2021 shortly before the Taliban retook control of Afghanistan. “We’re trying to get it back because they need things from us,” Mr. Trump said. He added that Bagram was strategically important for the United States because “it’s an hour away from where China makes its nuclear weapons.”Mr. Trump has said in the past that the United States should not have abandoned the air base, but his comments on Thursday were the first public acknowledgment that negotiations to reclaim it might be underway.