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 ReidReid: Comey should be investigated in wake of Russia report Spokesman: NY Times ignored Reid's comments in pre-election story on Russia Senate passes dozens of bills on way out of town MORE (D-Nev.) promised Wednesday votes on those provisions as amendments from Sens. Dianne FeinsteinDianne FeinsteinDem senator seeks more time for 'due diligence' on Sessions nomination Senate sets date for hearings on Sessions's attorney general nomination Senators move to protect 'Dreamers' MORE (D-Calif.), Richard BlumenthalRichard BlumenthalOvernight Tech: AT&T, Time Warner CEOs defend merger before Congress | More tech execs join Trump team | Republican details path to undoing net neutrality Overnight Energy: Trump taps EPA foe to head agency | Energy reform bill officially dead CNN’s parent company promises to defend journalistic independence MORE (D-Conn.) and Frank Lautenberg (D-N.J.).

Reid also set up amendment votes on the following amendments for Wednesday: Sen. Chuck GrassleyChuck GrassleyDem senator seeks more time for 'due diligence' on Sessions nomination Senate sets date for hearings on Sessions's attorney general nomination Mnuchin, Price meet with GOP senators MORE’s (R-Iowa) GOP substitute amendment; Sens. Patrick LeahyPatrick LeahyThe Hill's 12:30 Report The Hill's 12:30 Report Passing US-Canada preclearance would improve security and economy MORE (D-Vt.) and Susan CollinsSusan CollinsDems, greens gear up for fight against Trump EPA pick Medicare looms over Trump-Ryan alliance Senators crafting bill to limit deportations under Trump MORE's (R-Maine) amendment on gun trafficking; Sen. John CornynJohn CornynGOP senator: Russian hacking 'hardly news' Senators move to protect 'Dreamers' Democrats back down from shutdown threat MORE’s (R-Texas) amendment on conceal and carry rules; Sen. Richard BurrRichard BurrTop Intel Dem: Congress 'far from consensus' on encryption Trump must be an advocate for the Small Business Administration Dems pledge to fight Sessions nomination MORE’s (R-N.C.) amendment protecting gun rights of veterans; Sen. John BarrassoJohn BarrassoGOP eyes big gamble on ObamaCare Reid defends relationship with McConnell in farewell speech Overnight Energy: Trump taps EPA foe to head agency | Energy reform bill officially dead 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 AlexanderGOP eyes big gamble on ObamaCare Mnuchin, Price meet with GOP senators Reid bids farewell to the Senate 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.