Prosecutors in the corruption trial of U.S. Sen. Bob Menendez, D-New Jersey, turned their focus on Thursday to the senator’s advocacy with federal regulators on behalf of a port security business owned by co-defendant Salomon Melgen.

Prosecutors entered into evidence a receipt showing that Melgen played host to Menendez for a round of golf at a Florida course on Jan. 10, 2013, the day before a Menendez staffer made a series of inquiries to the U.S. Customs and Border Patrol on behalf of Melgen’s business.