Cornyn had negotiated the 2022 gun violence prevention law that the administration relied on for the ATF rule. Now he has 41 Senate Republicans who back his joint resolution to stop that rule. “Every time that they ask for bipartisanship, then if you provide bipartisan solutions, then they overreach and undermine any sort of good-faith negotiations that take place,” Cornyn said. Democrats have touted the rule, and the 2022 law the administration based it on, as a shining example of bipartisanship and a major step toward making background checks on gun purchases universal. In a floor speech Tuesday marking the...