He famously voted again the Iran nuclear deal. Why isn't anyone making that an issue? Make him explain. Did he support Trump's decision to tear up the deal? Now we are at war with Iran. Had the nuclear deal been in place today, we wouldn't be at war with Iran. Make him squirm.
This reminds me of Hillary's vote for the Iraq War resolution. She really thought the Democratic electorate was going to let it slide. Schumer will probably get a pass because his fate is in the hands of the Democratic Party establishment.