By Jonathan Stempel NEW YORK (Reuters) -A decorated U.S. Air Force veteran accused of defrauding donors in a fundraising campaign to help former President Donald Trump build a wall along the U.S.-Mexico border has agreed to plead guilty to wire fraud conspiracy and three tax charges. The U.S. Department of Justice revealed their plea agreement with Brian Kolfage, who led the “We Build the Wall” campaign, in a filing on Wednesday with the U.S. District Court in Manhattan. Kolfage is expected to formally enter his plea on April 21 before U.S. District Judge Analisa Torres. His lawyer did not imm…