In the wake of Sunday morning’s mass shooting at a nightclub in Orlando, Florida, Democrats are renewing calls to bar people on the terrorism watch list from purchasing weapons of war, such as the AR-15 used in the massacre.

Republicans have resisted the effort, warning that it is an unconstitutional abridgment of the Second Amendment. “I believe that our Republican colleagues, particularly so many of them now in a difficult political season, are going to find it very difficult,” Sen. Chuck Schumer (D-N.Y.) said Monday in a conference call with reporters.

Democrats tried after the mass shooting last year in San Bernardino, California, to bar people on the watch list from buying guns, just as domestic abusers, felons and several other categories of people are proscribed. The attempt to pass the amendment authored by Sen. Dianne Feinstein (D-Calif.) failed on a nearly party-line vote.

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