Sen. Richard Blumenthal (D-Conn.), the lead Senate sponsor of the bill, said the legislation would help improve the treatment of third-country workers who are lured to work in Iraq and Afghanistan only to be defrauded or enslaved.

"Modern-day slavery by government contractors — unknowingly funded by American taxpayers — is unconscionable and intolerable," Blumenthal said. "Current law prohibiting human trafficking is insufficient and ineffective, failing to prevent or punish abuses.

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"By increasing preventative scrutiny and investigation, this legislation will stop egregious human-rights abuses on U.S. military bases, increasing security for our troops and preventing waste of taxpayer dollars."

A co-sponsor, Sen. Marco RubioMarco Antonio RubioOvernight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions Senate passes 0B defense bill Trump bets base will stick with him on immigration MORE (R-Fla.), said it is unacceptable that these abuses are often supported by U.S. taxpayer dollars.

"This bill will help crack down on this dehumanizing practice, particularly in government contracting labor operations, and I am proud to support it as one more step we can do to punish human-rights abuses," Rubio said.

Under the bill, contractors with contracts worth $1 million or more would have to implement plans to prevent all abusive practices, and would have to notify the government if they have evidence that a subcontractor is involved in prohibited conduct.

The enforcement provisions of the bill would allow for criminal penalties, in part by expanding current rules related to the treatment of foreign workers inside the United States to foreign workers outside the country. The bill would also allow the government to remove certain employees or suspend contractors when violations are found.

Blumenthal's bill, S. 2234, is also co-sponsored by Sens. Susan CollinsSusan Margaret CollinsSenate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Ryan: Graham-Cassidy 'best, last chance' to repeal ObamaCare Collins skeptical of new ObamaCare repeal effort MORE (R-Maine), Al FrankenAlan (Al) Stuart FrankenGOP eying 'blue slip' break to help Trump fill the courts Overnight Regulation: FTC launches probe into Equifax | Dems propose tougher data security rules | NYC aims to slash greenhouse gas emissions | EPA to reconsider Obama coal ash rule Overnight Cybersecurity: Kaspersky to testify before House | US sanctions Iranians over cyberattacks | Equifax reveals flaw that led to hack MORE (D-Minn.), Joe Lieberman (I-Conn.), Claire McCaskillClaire Conner McCaskillGOP sees fresh opening with Dems’ single payer embrace Senators blast internet subsidy program It is time to make domestic terrorism a federal crime MORE (D-Mo.) and Rob PortmanRobert (Rob) Jones PortmanWeek ahead in tech: Debate over online sex trafficking bill heats up 'Hillbilly Elegy' author won't run for Senate Brown, Portman urge Trump administration to move quickly on a steel decision MORE (R-Ohio).

The House companion bill, H.R. 4259, was sponsored by Rep. James Lankford (R-Okla.), and is co-sponsored by House Oversight and Government Reform Committee Chairman Darrell Issa (R-Calif.) and Reps. Gerry ConnollyGerry ConnollyDem lawmaker warns of 'political and moral limitations’ to working with Trump Dems ready to deal with Trump — but it's complicated GAO: Fewer than one in four agencies will meet data center consolidation goals MORE (D-Va.), Elijah Cummings (D-Md.) and Chris Smith (R-N.J.).

Issa's committee is scheduled to hold a hearing on the bill Tuesday morning at 10 a.m., with Blumenthal and Portman expected to testify on the bill at that time.