A prosecutor accused Sen. Bob Menendez in a closing argument at his bribery trial Monday of putting the power of the onetime chairman of the Senate Foreign Relations Committee up for sale to benefit three New Jersey businessmen who showered him with hundreds of thousands of dollars in gold, cash and a luxury convertible. Assistant U.S. Attorney Paul Monteleoni told the Manhattan federal court jury that they’ll be able to trace hundreds of emails and text messages between the businessmen and Menendez and his wife to see the link between the businessmen and the bribe proceeds found in an FBI rai…