Republican senator, swarmed by protesters after Trump speech, calls for FBI probe By Lisa Lambert   Protesters confront U.S. Senator Rand Paul (R-KY) during a protest in Washington, U.S. August 28, 2020. REUTERS/Leah Millis   WASHINGTON (Reuters) - Republican Senator Rand Paul on Friday called on the FBI to investigate a crowd of protesters that swarmed him as he departed the White House after listening to U.S. President Donald Trump accept his party's nomination fo