“I was pleased Sen. Reid agreed to unlimited debate and amendments; that has always been my threshold for voting to allow legislation to be considered," Burr said. "Given that understanding, the issue can receive a full and open debate, amendments, and an amendment process with multiple opportunities to stop, alter, or kill the legislation.”

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The Senate is now debating S.649, the Safe Communities, Safe Schools Act, which would expand background checks on gun purchases, create new penalties on straw purchases and include new funding for school security.

The bill doesn’t include an assault weapons ban or limits on magazine clip capacity — although Senate Majority Leader Harry ReidHarry Mason ReidBiden's first 100 days is stylistic 'antithesis' of Trump The Memo: Washington's fake debate on 'bipartisanship' The Hill's Morning Report - Presented by Tax March - CDC in limbo on J&J vax verdict; Rep. Brady retiring MORE (D-Nev.) promised a vote on those provisions as an amendment.

Democrats have been pushing major gun reforms since December when a gunman killed 20 first graders and six school employees at Sandy Hook elementary in Newtown, Conn. Family members of the Newtown victims came to Washington, D.C., this week to meet with senators to persuade them to pass gun control reforms. 

A group of 14 GOP senators, lead by Sens. Mike LeeMichael (Mike) Shumway LeeRepublicans urge probe into Amazon government cloud-computing bid: report Allowing a racist slur against Tim Scott to trend confirms social media's activist bias Senate passes bipartisan B water infrastructure bill MORE (Utah), Rand PaulRandal (Rand) Howard PaulTim Scott sparks buzz in crowded field of White House hopefuls Sherrod Brown calls Rand Paul 'kind of a lunatic' for not wearing mask Overnight Health Care: WHO-backed Covax gets a boost from Moderna MORE (Ky.) and Ted CruzRafael (Ted) Edward CruzCheney drama exposes GOP's Trump rifts Pollster Frank Luntz: 'I would bet on' Trump being 2024 GOP nominee Tim Scott sparks buzz in crowded field of White House hopefuls MORE (Texas), threatened to filibuster any gun control reforms, requiring a 60-vote threshold, because they say it would violate Second Amendment rights. 

Burr was the only defection of the 14 senators.

This article was updated at 1:40 p.m. in order to include Burr's quote.