News stories about the alleged bounties last summer had prompted then-candidate Joseph R. Biden and congressional Democrats to attack Mr. Trump for failing to confront Moscow, in the heat of the presidential campaign. White House press secretary Jen Psaki on Thursday expressed no regret about Mr. Biden’s political attacks over the issue last year. She said that since Mr. Biden took office, “we wanted our intelligence community to look into those reports.” “They assessed with low to moderate confidence … that Russian intelligence officers sought to encourage Taliban attacks against U.S. and coalition personnel,” she said. The New York Times first reported last June that the U.S. intelligence community had concluded that a unit within the GRU, Russia’s military intelligence agency, offered payments to Afghan militants for attacks on coalition forces. Other media outlets said they confirmed the report, which created a backlash among some veterans and active-duty military with Mr. Trump’s candidacy.