Democratic presidential candidates Joe Biden and Pete Buttigieg, moderates who project themselves as pragmatic collaborators, are taking a no-compromise approach on the overhaul of the nation’s gun laws after the latest mass shooting. Campaigning separately in eastern Iowa on Monday, the former vice president and the mayor of South Bend, Indiana, say the minimum provisions include universal background checks, a ban on military-style weapons and high-capacity ammunition, and red flag laws to allow officials to confiscate firearms from dangerous people. Biden told reporters before a Labor Day picnic in Cedar Rapids that inaction from President Donald Trump and congressional Republicans...