"It is an outrage that in a year thus far defined by gun violence -- from massacres, to the murder of police, to hate crimes -- the U.S. Senate is preparing to consider an amendment that would dramatically weaken federal and state gun laws," the Brady Campaign to Prevent Gun Violence said in a joint statement with Coalition to Stop Gun Violence, Freedom States Alliance, Legal Community Against Violence, States United to Prevent Gun Violence, and Violence Policy Center.
"The practical effect of the amendment would be to reduce concealed carry permit regulations to the lowest common denominator," the groups said.
"The legislation would do nothing less than take state and local gun laws and tear them up," Schumer said today. "The great irony of this amendment is that the pro gun lobby has always said, 'Let the states decide.'"
Republicans were able to stall a bill to give Washington, D.C., a vote in the House by inserting an amendment that would have taken away the city council's right to pass any gun restrictions.
And a provision to allow loaded guns in national parks if allowed by state law was attached to a credit card reform bill.
ABC News' Z. Byron Wolf, Tom Shine and The Associated Press contributed to this report.