A New Jersey businessman who prosecutors say bribed Sen. Bob Menendez testified Monday that the Democrat told him in summer 2019 that he’d look into a state criminal probe threatening his business and later assured him there was no threat and boasted about saving him. At the time, Jose Uribe said in Manhattan federal court, he assumed that Menendez knew he had made a $15,000 down payment and was making monthly payments on a Mercedes-Benz for Menendez’s girlfriend, who married Menendez a year later. Prosecutors contend that the car, along with gold bars and hundreds of thousands of dollars in c…