WASHINGTON (AP) — Senate Majority Leader Harry Reid has decided that a proposed assault weapons ban won't be part of a gun control bill the Senate plans to debate next month, the sponsor of the ban said Tuesday, a decision that means the ban stands little chance of survival.

Instead, Sen. Dianne Feinstein said she will be able to offer her ban on the military-style firearms as an amendment. Feinstein is all but certain to need 60 votes from the 100-member Senate to prevail, but she faces solid Republican opposition and likely defections from some moderate Democrats.

"I very much regret it," Feinstein, D-Calif., told reporters of Reid's decision. "I tried my best."