Sen. Dianne FeinsteinDianne Emiel FeinsteinFive things to know about the elephant trophies controversy The feds need to be held accountable for role in Russia scandal Lawyer: Kushner is 'the hero' in campaign emails regarding Russia MORE (D-Calif.) and a half dozen other senators have proposed legislation setting a uniform national standard for the treatment of egg-laying hens, which would ensure egg producers aren't blocked from selling across state lines due to differing state standards.

Feinstein said on Thursday that six states already have their own standards, and 18 others could put their own rules in place soon, which could cause problems in the years ahead. She said beginning in 2015, for example, eggs produced in Iowa and Indiana will not be able to ship to California because they will not meet California's standards.

"Different standards in Michigan and Ohio will take effect later, further adding to the patchwork of regulations," she said. "As states with disparate standards continue to protect their own egg producers by banning the sale of eggs from States with lower or no standards, a complicated web of state laws will impair interstate commerce."

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Feinstein said her bill, S. 3239, would codify an agreement between the United Egg Producers and the Humane Society on how egg-laying hens should be treated and how eggs should be labeled.

"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," she said. "Producers must enlarge cages for egg-laying hens and allow space for the birds to engage in natural behaviors such as nesting and perching."

Under the bill, producers would have as long as 18 years to meet these standards, which also includes a ban on starving chickens as a means of increasing egg production. In addition, it would prohibit excessive levels of ammonia in hen houses and require "humane euthanasia of spent hens."

Feinstein said the egg industry itself has asked Congress to approve this legislation to help it better cope with the increasing web of state standards.

"The egg industry brought this legislation to Congress and has asked us to help them implement the uniform regulations needed to survive and grow," she said. "The egg industry and the Humane Society are lock-step in their support for this bill. They are joined in endorsing the bill by the American Veterinary Medical Association and the Consumer Federation of America."

The bill is co-sponsored by Sens. Richard Blumenthal (D-Conn.), Scott Brown (R-Mass.), Maria CantwellMaria Elaine CantwellDemocrats scramble to contain Franken falloutĀ  FCC rolls back media regulations in move that critics say benefits Sinclair Steps Congress can take to save affordable housing in tax reform MORE (D-Wash.), Jeff MerkleyJeffrey (Jeff) Alan MerkleySenate Democrats introduce bill to block Trump's refugee ban Overnight Defense: Army secretary easily confirmed | Army denies changing mental health standards | US to trim peacekeeping funds | House passes bill to speed up approval of battlefield medicines Senate approves Trump's Army pick MORE (D-Ore.), David VitterDavid VitterQuestions loom over Franken ethics probe You're fired! Why it's time to ditch the Fed's community banker seat Overnight Energy: Trump set to propose sharp cuts to EPA, energy spending MORE (R-La.) and Ron WydenRonald (Ron) Lee WydenCongress faces growing health care crisis in Puerto Rico Photos of the Week: Nov. 13-17 Senate panel approves GOP tax plan MORE (D-Ore.).