"The United Egg Producers and the Humane Society of the United States worked for over a year to reach this compromise, and I believe it is one that strikes a very fair balance," Feinstein said last month. "Producers must enlarge cages for egg-laying hens and allow space for the birds to engage in natural behaviors such as nesting and perching."

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Both the bill and the amendment set minimum floor space requirements per hen, and would phase in these requirements over 18 years. It would also prohibit excessive levels of ammonia in hen houses and require humane euthanasia of spent hens.

The HSUS issued a statement on Tuesday calling for the adoption of the amendment by the Senate.

"It's my hope that senators break free of the old paradigm — animal advocates versus agriculture industries — and recognize that this solution serves all parties, especially consumers," HSUS CEO Wayne Pacelle said. "Failure to enact this provision will mean that the egg industry and animal advocates will go back to costly state-by-state battles that will slow down progress, cost both sides hundreds of millions of dollars and leave all parties with uncertain outcomes."

Sens. Richard BlumenthalRichard BlumenthalOvernight Finance: Trump adviser softens tone on NAFTA | Funding bill to be released Tuesday | GOP leader won't back Trump tariff plan Trump gets chance to remake the courts Wrestling mogul McMahon could slam her way into Trump administration MORE (D-Conn.), Scott Brown (R-Mass.), Maria CantwellMaria CantwellOvernight Energy: Dakota pipeline standoff heats up Obama rescinds Arctic offshore drilling proposal Overnight Energy: Hopes rise for Flint aid MORE (D-Wash.), Jeff MerkleyJeff MerkleyDem senator to Trump: 'You have no mandate' GOP senators wary of nuking filibuster Dem senators charge: Trump not draining the swamp MORE (D-Ore.), David VitterDavid VitterPoll: Republican holds 14-point lead in Louisiana Senate runoff Louisiana dishes last serving of political gumbo Trump tweets about flag burning, setting off a battle MORE (R-La.) and Ron WydenRon WydenOvernight Cybersecurity: Fed agency IT report cards | Senate Dems push for briefing on Russia hacks Pentagon's suppressed waste report only tip of the inefficient machine Hoyer pushes White House for briefing on Russian election interference MORE (D-Ore.) sponsored Feinstein's original bill. But the amendment to the farm bill also has the support of Sens. Susan CollinsSusan CollinsMedicare looms over Trump-Ryan alliance Senators crafting bill to limit deportations under Trump Cornyn: ‘Virtual certainty’ Sessions and Price will be confirmed MORE (R-Maine), John KerryJohn KerryAs Congress adjusts to Trump, Iran put under the pressure it deserves Sharpton pressures Dems on Trump nominees Words are not enough — US must support Christians who survived genocide in Iraq MORE (D-Mass.), Joe Lieberman (I-Conn.), Patty MurrayPatty MurrayTop Dem signals likely opposition to Sessions nomination Overnight Finance: Trump takes victory lap at Carrier plant | House passes 'too big to fail' revamp | Trump econ team takes shape Senate Dems: Force Cabinet nominees to release tax returns MORE (D-Wash.), Bernie SandersBernie SandersSanders: GOP blocked 'Trump proposal' to lower drug prices Pentagon's suppressed waste report only tip of the inefficient machine Weather Channel strikes back at Breitbart MORE (I-Vt.) and Robert MenendezRobert MenendezThe right person for State Department is Rudy Giuliani Warren, Menendez question shakeup at Wells Fargo Democrats press Wells Fargo CEO for more answers on scandal MORE (D-N.J.).

Senators are currently working on an agreement on which amendments to the bill might be considered.