Sen. Chris MurphyChristopher (Chris) Scott MurphyChris Murphy’s profile rises with gun tragedies Murphy faces criticism from GOP challenger over fundraising email Democrat: Republicans who believe in more gun control afraid of being 'politically punished' MORE finally gave up control of the Senate floor early Thursday morning, just shy of 15 hours after Democrats started their filibuster to protest Congress’ inaction on gun control. 

"I've been so angry that this Congress has mustered absolutely no response to mass shooting after mass shooting," Murphy said, ending his marathon floor session. "This exercise over the course of the last 14 hours has been in many ways a plea for this body to come together to find answers." 

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The Connecticut Democrat took to the Senate floor around 11:20 a.m., pledging to “stand on this floor and talk ... for, frankly, as long as I can.” 

Though Murphy said he wanted a deal on strengthening background checks and blocking suspected terrorists from buying a guns or explosive — and suggested one was possible — it’s unclear if the move pushed the Senate closer to passing a bipartisan compromise.

Instead, Murphy indicated that there is an "understanding" to allow for votes on two Democratic proposals but acknowledged "there's no guarantee that those amendments pass." 

Sen. John CornynJohn CornynGun proposal picks up GOP support House bill set to reignite debate on warrantless surveillance Republicans jockey for position on immigration MORE (R-Texas) said he is still trying to work with Democrats to see if the two parties could find an agreement on suspected terrorists buying guns but said he's skeptical of Democrats' intentions.

"We're trying to find out ... whether this is an effort to find a solution and common ground or whether this is just an effort to try to embarrass people," the Senate's No. 2 Republican told The Hill Wednesday evening. "I haven't yet concluded which one it is." 

Minority Leader Harry ReidHarry ReidChris Murphy’s profile rises with gun tragedies Republicans are headed for a disappointing end to their year in power Obama's HHS secretary could testify in Menendez trial MORE (D-Nev.) shot down talk of an agreement Wednesday night, calling talk of "so-called negotiations ... little more than a smokescreen." 

“We are still waiting for Republicans to find the courage to stand up to the National Rifle Association and join with Democrats to keep guns out of the hands of terror suspects," he said. 

Murphy's effort won the support of dozens of Democratic senators, including Charles SchumerCharles (Chuck) Ellis SchumerOvernight Health Care: Schumer calls for tying ObamaCare fix to children's health insurance | Puerto Rico's water woes worsen | Dems plead for nursing home residents' right to sue Crying on TV doesn't qualify Kimmel to set nation's gun agenda Trump knocks ‘fake’ news coverage of his trip to Puerto Rico MORE (N.Y.) and Elizabeth WarrenElizabeth Ann WarrenOvernight Finance: Lawmakers grill Equifax chief over hack | Wells Fargo CEO defends bank's progress | Trump jokes Puerto Rico threw budget 'out of whack' | Mortgage tax fight tests industry clout Michelle Obama is exactly who the Democrats need to win big in 2020 Wells Fargo chief defends bank's progress in tense Senate hearing MORE (Mass.), as well as Hillary ClintonHillary Diane Rodham ClintonChris Murphy’s profile rises with gun tragedies DNC, RNC step up cyber protections Gun proposal picks up GOP support MORE, the party’s presumptive nominee, and her rival Sen. Bernie SandersBernard (Bernie) SandersChris Murphy’s profile rises with gun tragedies Clip shows Larry David and Bernie Sanders reacting after discovering they're related For now, Trump dossier creates more questions than answers MORE (I-Vt.). 

Sen. Cory Booker (D-N.J.) — during an impassioned speech early Thursday morning — said it was "unacceptable" for the Senate to not take action on gun control.
 
"I have stood on too many street corners looking down at bodies," said Booker, the former mayor of Newark, N.J.

The Senate is currently considering the Commerce, Justice and Science appropriations bill. Though no votes were scheduled for Wednesday, Murphy’s effort blocked his colleagues from making any amendments “pending” — the first step to getting a potential vote. 

Murphy and Democrats argued against starting debate on the legislation until reaching an agreement in light of the tragedy in Orlando over the weekend.

"The CJS bill includes the Department of Justice appropriation. So we are raising this issue on a bill which has real relevance on national security and law enforcement," said Sen. Dick DurbinRichard (Dick) Joseph DurbinGun proposal picks up GOP support Durbin: I had 'nothing to do' with Curbelo snub Republicans jockey for position on immigration MORE (Ill.), the Senate's No. 2 Democrat. 

"The point that we're getting to is this is the beginning of an important national debate brought on by the tragedy in Orlando," he said later in the night.

Democrats’ frustration boiled over three days after the deadliest mass shooting in U.S. history. A gunman armed with a Sig Sauer MCX rifle and a handgun killed 49 people at an Orlando nightclub and wounded 53 more early Sunday morning.

Lawmakers repeatedly lashed out at their colleagues Wednesday for not acting despite a string of high-profile shootings in recent years.

"Mass shootings are now happening like clockwork in America," Sen. Ron WydenRonald (Ron) Lee WydenHouse bill set to reignite debate on warrantless surveillance Senate confirms No. 2 spot at HHS, days after Price resigns Overnight Cybersecurity: Equifax CEO faces outraged lawmakers | Dem presses voting machine makers on cyber defense | Yahoo says 3 billion accounts affected by 2013 breach MORE (D-Ore.) said. "And like clockwork, this Congress does nothing about it."

Warren said if lawmakers don’t act then after the next attack lawmakers will have “blood on their hands.” 

Sen. Claire McCaskillClaire Conner McCaskillKoch-backed group targets red-state Dems on tax reform Overnight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open Las Vegas highlights Islamist terrorism is not America's greatest domestic threat MORE (D-Mo.) questioned what “invisible hand” was stopping the Senate from getting a deal on gun control, asking, “Is everyone so afraid of the NRA?”

The marathon speech wasn't without light moments. Murphy spoke from the floor to his son Owen, who he said was sitting in the Senate gallery, apologizing for missing "pizza night." 

"I hope that you'll understand some day why we're doing this," he said. "Sometimes even if you don't get everything that you want, trying hard, trying and trying and trying to do the right thing, is ultimately just as important." 

Murphy said Democrats didn't decide to stage the talkathon until Wednesday morning, though a staffer clarified they came up with the idea Tuesday. 

Since the Orlando attack, Democrats have put a renewed focused on legislation meant to block the sale of guns to people on terrorist watchlists. 

Noting the filibuster gained wide-spread attention Wednesday, Sen. Amy KlobucharAmy Jean KlobucharFacebook shifts strategy under lawmaker pressure Competition law has no place raising prices some say are ‘too low’ CNN to host town hall featuring Nancy Pelosi MORE (D-Minn.) said "the country is watching this because people are waiting for action." 

Democrats have pledged to force a vote over a proposal from Sen. Dianne FeinsteinDianne Emiel FeinsteinGun proposal picks up GOP support Gingrich: Banning rapid fire gun modification is ‘common sense’ House bill set to reignite debate on warrantless surveillance MORE (D-Calif.), but Republicans argue the measure is too broad and would negatively impact individuals not on the terrorist watchlist. 

Instead, Republicans are backing Cornyn's measure that would allow the attorney general to delay suspected terrorists from getting a gun for up to 72 hours as they try to get a court to approve blocking the sale of the firearm. 

Reid, however, said Cornyn's proposal, as well as a forthcoming bill from Sen. Pat Toomey (R-Pa.), would "move us farther away from compromise, not closer."

Toomey's legislation would require the attorney general to create a list of "likely terrorists" that could be blocked from buying guns. The list would then be submitted to the Foreign Intelligence Surveillance Court, which would review it annually and remove any Americans inadvertently included, according to a summary of the forthcoming bill from his office.