Manchin and Toomey’s deal would expand background checks to cover all sales at gun shows and over the Internet. Those background checks would have to be accompanied by records proving to law enforcement officials they took place. It would exempt gun sales and transfers between friends and acquaintances, and explicitly ban the federal government from creating a national firearms registry.

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The Senate is debating S.649, the Safe Communities, Safe Schools Act, which would expand background checks on gun purchases, crack down on gun trafficking and beef up security in schools. GOP senators have vowed to block that bill, claiming it goes too far and infringes on the rights of gun owners.

The bill doesn’t include an assault weapons ban or limits on magazine clip capacity — although Senate Majority Leader Harry ReidHarry ReidCharles Koch thanks Harry Reid for helping his book sales Warren cautions Dems against infighting Dems see surge of new candidates MORE (D-Nev.) promised Wednesday votes on those provisions as amendments from Sens. Dianne FeinsteinDianne FeinsteinDem senators urged Obama to take action on Russia before election Senate panel questions Lynch on alleged FBI interference The Hill's 12:30 Report MORE (D-Calif.), Richard BlumenthalRichard BlumenthalOnly Congress can enable drone technology to reach its full potential Overnight Regulation: Labor groups fear rollback of Obama worker protection rule | Trump regs czar advances in Senate | New FCC enforcement chief Dems urge Sessions to reject AT&T-Time Warner merger MORE (D-Conn.) and Frank Lautenberg (D-N.J.).

Reid also set up amendment votes on the following amendments for Wednesday: Sen. Chuck GrassleyChuck GrassleySenate Dems plan floor protest ahead of ObamaCare repeal vote It's time for Republicans to play offense while Democrats are weak A bipartisan consensus against 'big pharma' is growing in Congress MORE’s (R-Iowa) GOP substitute amendment; Sens. Patrick LeahyPatrick LeahyA bipartisan consensus against 'big pharma' is growing in Congress Going national with automatic voter registration Republicans slam Trump’s new policy toward Cuba MORE (D-Vt.) and Susan CollinsSusan CollinsIs Senate ObamaCare repeal bill too mean? Funeral for the filibuster: GOP will likely lay Senate tool to rest This week: Senate races toward ObamaCare repeal vote MORE's (R-Maine) amendment on gun trafficking; Sen. John CornynJohn CornynSenate adds penalty for going uninsured to healthcare bill The Hill's 12:30 Report Cornyn: GOP won't delay ObamaCare repeal vote MORE’s (R-Texas) amendment on conceal and carry rules; Sen. Richard BurrRichard BurrSenate intel panel to hold hearing on Russian meddling in Europe The Hill's Whip List: Senate ObamaCare repeal bill Overnight Tech: Uber CEO resigns | Trump's Iowa tech trip | Dems push Sessions to block AT&T-Time Warner deal | Lawmakers warned on threat to election systems | MORE’s (R-N.C.) amendment protecting gun rights of veterans; Sen. John BarrassoJohn BarrassoSenate confirms NRC chairwoman to new term A bipartisan consensus against 'big pharma' is growing in Congress McConnell allies confident in healthcare win MORE’s (R-Wyo.) amendment on privacy of gun owners; and a mental health amendment from Sens. Tom HarkinTom HarkinDistance education: Tumultuous today and yesterday Grassley challenger no stranger to defying odds Clinton ally stands between Sanders and chairmanship dream MORE (D-Iowa) and Lamar AlexanderLamar AlexanderThe Hill's Whip List: Senate ObamaCare repeal bill Trump administration pays June ObamaCare subsidies to insurers Republicans and the lost promise of local control in education MORE (R-Tenn.).

All of those amendments will be held to a 60-vote threshold. Reid has promised an open amendment process, so several more amendments could receive votes if additional agreements are reached.

Democrats have been pushing for stricter gun laws since December, when a gunman killed 20 first-graders and six school employees at Sandy Hook Elementary School in Newtown, Conn.

“In these final hours, we're engaged in a full court press on both sides of the aisle for a bipartisan compromise," Blumenthal said after the amendment agreement was announced. "These votes afford an opportunity to keep faith with the families of Newtown, and 3,400 victims of gun violence since that unspeakable tragedy. Just as the world has watched Newtown since December 14, Newtown will be watching the U.S. Senate tomorrow."

This article was updated at 8:50 p.m. to include Sen. Blumenthal's statement.