MILWAUKEE — Senate Republicans gathered at the Republican National Convention are predictably pressuring Sen. Bob Menendez (D-NJ) to resign his office after a federal jury found him guilty on 16 counts, including accepting hundreds of thousands of dollars in bribes and acting as a foreign agent. But those same Senate Republicans shrug off concerns about Jared Kushner — President Donald Trump’s son-in-law and a former senior adviser — who many Democrats accuse of corruption involving his private equity firm, Affinity Partners, and its $2 billion business deal with the Saudi crown prince. Kushne…