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 ReidDraft House bill ignites new Yucca Mountain fight Week ahead: House to revive Yucca Mountain fight Warren builds her brand with 2020 down the road MORE (D-Nev.) promised Wednesday votes on those provisions as amendments from Sens. Dianne FeinsteinDianne FeinsteinDemocrats exploring lawsuit against Trump Overnight Finance: Dems explore lawsuit against Trump | Full-court press for Trump tax plan | Clock ticks down to spending deadline Comey to testify before Senate Judiciary Committee MORE (D-Calif.), Richard BlumenthalRichard BlumenthalCongress eyes airline overhaul after United incident Dem senator blasts VA for outsourcing veterans suicide line Democrats exploring lawsuit against Trump MORE (D-Conn.) and Frank Lautenberg (D-N.J.).

Reid also set up amendment votes on the following amendments for Wednesday: Sen. Chuck GrassleyChuck GrassleyComey to testify before Senate Judiciary Committee GOP to kill language exempting staff from new ObamaCare repeal bill House cyber chairman wants to bolster workforce MORE’s (R-Iowa) GOP substitute amendment; Sens. Patrick LeahyPatrick LeahyHollywood, DC come together for First Amendment-themed VIP party The Hill's 12:30 Report Lawmakers talk climate for Earth Day, Science March MORE (D-Vt.) and Susan CollinsSusan CollinsSunday shows preview: Trump plans next steps The Hill's 12:30 Report Overnight Energy: Lawmakers work toward deal on miners’ benefits MORE's (R-Maine) amendment on gun trafficking; Sen. John CornynJohn CornynSenate's No. 2 Republican: Border tax 'probably dead' McConnell: Senate will pass short-term funding bill to avoid shutdown The Hill's 12:30 Report MORE’s (R-Texas) amendment on conceal and carry rules; Sen. Richard BurrRichard BurrTrump voter who cast ballot illegally won’t be charged Burr: US in new Cold War with Russia Senator: No signs of GOP 'slow-walking' Russia investigation MORE’s (R-N.C.) amendment protecting gun rights of veterans; Sen. John BarrassoJohn BarrassoTrump shouldn’t cater to a tech industry that hates him Poll: Sanders most popular senator in the US The animal advocate 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 AlexanderLawmakers reintroduce online sales tax bills Overnight Healthcare: New GOP health bill on life support | ObamaCare insurer threatens to leave over subsidies Trump's FDA nominee clears key Senate committee 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.