Rep. Darrell Issa (R-Calif.) is calling on congressional appropriators to cut off all future funding for the United Nations Relief and Works Agency (UNRWA) ahead of a federal spending deadline next month, according to a letter exclusively obtained by The Post. “In light of UNRWA’s record of troublesome allegations and disturbing revelations since Hamas’s October 7 terrorist attack on Israel, we believe that going forward no further US taxpayer funds can be given to the agency,” Issa wrote in a Wednesday letter to Senate and House appropriators working on spending bills that include foreign aid. “The totality of evidence regarding...