Sens. Patrick LeahyPatrick Joseph LeahyOvernight Regulation: Massachusetts AG sues Equifax | Trump weighs easing rules on gun exports | EPA nominee to fight worker safety rule in court Trump to ease rules on gun exports: report Overnight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions MORE (D-Vt.) and Susan CollinsSusan Margaret CollinsGun proposal picks up GOP support Giffords, Scalise highlight party differences on guns Agricultural trade demands investment in MAP and FMD MORE (R-Maine) will unveil legislation on Monday aimed at curbing the illegal trafficking of firearms.

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Collins’s spokesman Kevin Kelley told The Hill in an email that details about the bill were coming “shortly.” 

It’s unclear how the legislation would differ from Leahy’s previously introduced bill which would make it easier for federal law enforcement officials to crack down on so-called “straw purchasers.” 

But the news that Collins is on board with Leahy’s effort is the latest evidence of a growing bipartisan consensus to take at least some steps to stem the nation’s epidemic of gun violence.

Leahy’s earlier bill would add a new provision to the criminal code to make it illegal to purchase firearms on behalf of persons who are prohibited from owning them. Federal prosecutors now have little legal basis to file charges against gun traffickers and often must rely on technical paperwork violations to build their cases.

Last week, the Senate Judiciary Committee was scheduled to mark up Leahy’s legislation, 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’s (D-Calif.) renewal of the federal assault weapons ban, a measure introduced by Sen. Barbara BoxerBarbara BoxerTrump riles Dems with pick for powerful EPA job Pelosi's chief of staff stepping down Time is now to address infrastructure needs MORE (D-Calif.) to increase federal grants for school safety, and Sen. 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’s (D-N.Y.) bill to expand background checks on private gun sales.

The mark-up was delayed until this week, to give Schumer more time to work out a deal with Republicans, who say expanded background checks can’t include any semblance of a national registry to track gun purchases.

Lawmakers have resumed debate over gun control in the aftermath of December’s tragic shooting at an elementary school in Newtown, Conn.

While President Obama is pushing for bans on assault weapons and high-capacity clips as well as mandatory background checks, it is uncertain which of these measures can pass. The nation’s gun lobby and GOP lawmakers have vowed to wage a fierce fight against any new gun ownership restrictions.

Senate Majority 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.) has said however that he would allow a floor vote on any legislation which passes through committee. And on Sunday, Speaker John BoehnerJohn Andrew Boehner‘Lone wolf’ characterization of mass murderers is the epitome of white privilege Pelosi urges Ryan to create select committee on gun violence Ex-congressman Michael Grimm formally announces bid for old seat MORE (R-Ohio) said the House would consider any gun-control measures passed by the Senate.