WASHINGTON — A combination of public and private pressure prompted President Trump to overturn his administration’s recent move to allow elephants shot for sport in Zimbabwe and Zambia to be imported back to the United States as trophies, according to interviews with several individuals briefed on the decision. Trump’s announcement Friday that he was putting the decision “on hold” until he could personally review it marked animal welfare activists’ first federal victory since the president took office in January, and came just hours after the White House press secretary had defended the idea of renewing the controversial trophy imports. The administration faced blistering criticism on both the left and right after the U.S.