(CNN) – A key player in negotiations over potential gun control legislation said on Tuesday a planned GOP filibuster of the bill won’t occur if Democrats allow Republicans to bring amendments up for a vote. Sen. Tom Coburn, speaking on CNN’s “Erin Burnett Outfront,” said a filibuster that’s been promised by more than a dozen fellow Republicans would prevent Americans from seeing where their elected officials stand on the issue. “It’s not going to be filibustered,” Coburn said, adding that the Senate Majority Leader Harry Reid needs to offer "an open amendment process" in order for Republicans to agree to...