A half-dozen Democrats who are longtime gun control champions are hoping to keep their fight alive in the GOP-controlled Congress with a new bill that would vastly restrict ammunition capacities.

Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.) on Thursday touted the bill, which would ban magazines of more than 10 rounds, hours after reports circulated that police had foiled a mass shooting plot aimed at Congress.

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“Think of the damage that someone could do in the U.S. Capitol with 30 rounds,” he said at a briefing.

The bill is the first piece of gun control legislation since Republican won control of the Senate. Though it has more than 100 co-sponsors in the House, the bill has virtually no chance of a vote in either chamber.

Two years after losing their fight to expand background checks following the mass shooting at a school in Newtown, Conn., the group of lawmakers insisted that their fight was not over.

Rep. Elizabeth Esty (D-Conn), who represents Newtown, said the number of co-sponsors for the bill has doubled in the last year.

“The support is growing,” she said. “The momentum has not stopped.”

Esty joined Sen. Robert Menendez Robert (Bob) MenendezKasie Hunt to host lead-in show for MSNBC's 'Morning Joe' Senators ask for removal of tariffs on EU food, wine, spirits: report VOA visa decision could hobble Venezuela coverage MORE (D-N.J.) as well as Connecticut’s Democratic Senate duo, Murphy and Sen. Richard Blumenthal, to announce the legislation.

Murphy stressed that he has not met “a single hunter or a single person who hunts for sport” who needs more than 10 rounds.

He said those who wanted high-capacity magazines were more interested in “arming against the government.”