The Senate gun reform bill 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 Reid promised to allow a vote on those provisions as an amendment.

Some GOP senators, lead by Sens. Mike LeeMichael (Mike) Shumway LeeThe 14 GOP senators who voted against Trump’s immigration framework Prison sentencing bill advances over Sessions objections Grassley ‘incensed’ by Sessions criticism of proposed sentencing reform legislation MORE (R-Utah), Rand PaulRandal (Rand) Howard PaulDem wins Kentucky state House seat in district Trump won by 49 points GOP's tax reform bait-and-switch will widen inequality Pentagon budget euphoria could be short-lived MORE (R-Ky.) and Ted CruzRafael (Ted) Edward CruzOvernight Health Care: Trump eases rules on insurance outside ObamaCare | HHS office on religious rights gets 300 complaints in a month | GOP chair eyes opioid bill vote by Memorial Day HHS official put on leave amid probe into social media posts Trump, Pence to address CPAC this week MORE (R-Texas), have threatened to filibuster any gun-control reform legislation, but several other GOP members came forward Tuesday to say they would not support their colleagues efforts to filibuster debate on the gun-control legislation.

Republicans have expressed concern that extending background checks could create a federal registry of gun owners and make it harder for family members to transfer firearms. Sens. Joe ManchinJoseph (Joe) ManchinPavlich: The claim Trump let the mentally ill get guns is a lie Toomey to introduce bill broadening background checks for firearms Scott Walker backs West Virginia attorney general in GOP Senate primary MORE (D-W.Va.) and Pat Toomey (R-Pa.) are working on a compromise to the background check provision. Reid has said he is hopeful that a bipartisan agreement is reached, but added that he’s move forward on the legislation either way.

Sen. Charles GrassleyCharles (Chuck) Ernest GrassleyPavlich: The claim Trump let the mentally ill get guns is a lie Congress fails miserably: For Asian-Americans, immigration proposals are personal attacks Grassley, Dems step up battle over judicial nominees MORE (R-Iowa) has also said he'd introduce his own gun violence bill as an alternative to the Democratic proposal because he’s said there are too many unanswered question on enforcement in the Democrats’ bill.