The Supporting Working Moms Act, introduced by Sen. Jeff MerkleyJeff MerkleyOvernight Regulation: Labor groups fear rollback of Obama worker protection rule | Trump regs czar advances in Senate | New FCC enforcement chief Dems urge Sessions to reject AT&T-Time Warner merger Dems step up attacks on GOP ObamaCare bill MORE (D-Ore.), would seek to expand current law to cover millions of salaried workers.

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Merkley said a recent Department of Health and Human Services (HHS) report illustrates why it's necessary to expand the program. That report said businesses that give more leniency to breastfeeding mothers experience "lower health care costs, lower rates of absenteeism, and better retention of experienced employees."

"Breastfeeding is good for babies, it's good for moms, and it's good for business," Merkley said in a statement released on his website.

The HHS report, "The Business Case for Breastfeeding," said that on average, each milk expression session lasts a little more than 15 minutes long, and that breastfeeding employees usually need no more than an hour each work day to tend to that process.

So far, Merkley's legislation has garnered local support from Dr. Marion Rice, the Director of the Breastfeeding Coalition of Oregon as well as Portland's Chief of Police, Mike Reese. The measure is co-sponsored by Sens. Tom HarkinTom HarkinDistance education: Tumultuous today and yesterday Grassley challenger no stranger to defying odds Clinton ally stands between Sanders and chairmanship dream MORE (D-Iowa) and Elizabeth WarrenElizabeth WarrenWhat does the working class want? Better schedules. Live coverage: Senate GOP unveils its ObamaCare repeal bill Overnight Regulation: Labor groups fear rollback of Obama worker protection rule | Trump regs czar advances in Senate | New FCC enforcement chief MORE (D-Mass.).

Merkley also has a partner in Rep. Carolyn Maloney (D-N.Y.), who yesterday introduced H.R. 1941, which is the House companion bill.