CAIRO — Republican Sen. Lindsey Graham sought to reassure the Arab world Sunday over the prospect of Donald Trump becoming president, saying in Cairo that Congress would continue to play a primary role in foreign policy, “regardless of what Mr. Trump says or does.” “The Congress is going to be around no matter who is president,” Graham told reporters after meeting with Egyptian President Abdel-Fatah el-Sissi as part of a Republican congressional delegation touring the Middle East. “All of us, regardless of what Mr.