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 ReidRyan says Trump, GOP 'in complete sync' on ObamaCare Congress has a mandate to repeal ObamaCare Keith Ellison picks ex-DNC Latino as press secretary MORE (D-Nev.) promised Wednesday votes on those provisions as amendments from Sens. Dianne FeinsteinDianne FeinsteinFeinstein: Russia's interference affected outcome of election 'Future of America' at stake with hacking, Feinstein says Sunday shows preview: Trump allies appear after John Lewis criticism MORE (D-Calif.), Richard BlumenthalRichard BlumenthalTakata will plead guilty, pay B in faulty airbag probe Corrected — Lawmakers: Trump can't stop investigation of Clinton email case Overnight Defense: Mattis cruises through confirmation hearing MORE (D-Conn.) and Frank Lautenberg (D-N.J.).

Reid also set up amendment votes on the following amendments for Wednesday: Sen. Chuck GrassleyChuck GrassleyJeff Sessions will protect life Justice, FBI to be investigated over Clinton probes Pence meets with Kaine, Manchin amid Capitol Hill visit MORE’s (R-Iowa) GOP substitute amendment; Sens. Patrick LeahyPatrick LeahyJustice, FBI to be investigated over Clinton probes Sessions: Grabbing a woman's genitals without consent is sexual assault Live coverage of Sessions confirmation hearing MORE (D-Vt.) and Susan CollinsSusan CollinsSchumer puts GOP on notice over ObamaCare repeal 9 GOP senators Trump must watch out for Trump could alter Supreme Court for decades to come MORE's (R-Maine) amendment on gun trafficking; Sen. John CornynJohn CornynTrump opens can of worms with blast at drugmakers Senators wrestle with whether to back Tillerson Senate takes first step toward repealing ObamaCare MORE’s (R-Texas) amendment on conceal and carry rules; Sen. Richard BurrRichard BurrSenate Intel panel to probe Trump team's ties to Russia Trump's CIA nominee seeks to calm nerves The Hill's 12:30 Report MORE’s (R-N.C.) amendment protecting gun rights of veterans; Sen. John BarrassoJohn BarrassoOvernight Energy: Former Exxon chief Tillerson takes the hot seat Republicans scramble on ObamaCare replacement plan Dem: EPA pick should answer questions before hearing MORE’s (R-Wyo.) amendment on privacy of gun owners; and a mental health amendment from Sens. Tom HarkinTom HarkinGrassley challenger no stranger to defying odds Clinton ally stands between Sanders and chairmanship dream Do candidates care about our health or just how much it costs? MORE (D-Iowa) and Lamar AlexanderLamar Alexander9 GOP senators Trump must watch out for Hearing delayed for Trump’s Labor pick Live coverage: The Senate's 'vote-a-rama' 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.