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 ReidVirginia was a wave election, but without real change, the tide will turn again Top Lobbyists 2017: Grass roots Boehner confronted Reid after criticism from Senate floor MORE (D-Nev.) promised Wednesday votes on those provisions as amendments from Sens. Dianne FeinsteinDianne Emiel FeinsteinFive things to know about the elephant trophies controversy The feds need to be held accountable for role in Russia scandal Lawyer: Kushner is 'the hero' in campaign emails regarding Russia MORE (D-Calif.), Richard Blumenthal (D-Conn.) and Frank Lautenberg (D-N.J.).

Reid also set up amendment votes on the following amendments for Wednesday: Sen. Chuck GrassleyCharles (Chuck) Ernest GrassleyFBI informant gathered years of evidence on Russian push for US nuclear fuel deals, including Uranium One, memos show Klobuchar taking over Franken's sexual assault bill Lawyer: Kushner is 'the hero' in campaign emails regarding Russia MORE’s (R-Iowa) GOP substitute amendment; Sens. Patrick LeahyPatrick Joseph LeahyLawmakers, celebs honor Tony Bennett with Library of Congress Gershwin Prize Dem senator jokes: 'Moment of weakness' led me to share photo comparing Trump, Obama Leahy presses Trump court nominee over LGBTQ tweets MORE (D-Vt.) and Susan CollinsSusan Margaret CollinsStates fill family caregiver void left by Congress GOP senator: ObamaCare fix could be in funding bill Collins: Pass bipartisan ObamaCare bills before mandate repeal MORE's (R-Maine) amendment on gun trafficking; Sen. John CornynJohn CornynGOP senator: ObamaCare fix could be in funding bill Senate GOP running out of options to stop Moore Texas Republicans slam White House over disaster relief request MORE’s (R-Texas) amendment on conceal and carry rules; Sen. Richard BurrRichard Mauze BurrOvernight Energy: Chemical safety regulator's nomination at risk | Watchdog scolds Zinke on travel records | Keystone pipeline spills 210,000 gallons of oil Overnight Regulation: Senators unveil bipartisan gun background check bill | FCC rolls back media regs | Family leave credit added to tax bill | Senate confirms banking watchdog Collins ‘leaning against’ Trump EPA chemical nominee MORE’s (R-N.C.) amendment protecting gun rights of veterans; Sen. John BarrassoJohn Anthony BarrassoPruitt to testify on EPA agenda at House, Senate hearings Overnight Energy: Senate confirms top EPA air regulator | Feds to roll back emissions rule for big trucks | Defense bill mandates climate study Senate confirms top air regulator at EPA MORE’s (R-Wyo.) amendment on privacy of gun owners; and a mental health amendment from Sens. Tom HarkinTom HarkinThe Hill's 12:30 Report Distance education: Tumultuous today and yesterday Grassley challenger no stranger to defying odds MORE (D-Iowa) and Lamar AlexanderAndrew (Lamar) Lamar AlexanderGOP senator: ObamaCare fix could be in funding bill Collins: Pass bipartisan ObamaCare bills before mandate repeal Murkowski: ObamaCare fix not a precondition for tax vote 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.