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 RubioSenators pledge action on Saudi journalist’s disappearance Senators concerned as Trump official disputes UN climate change warning Rubio: Response to death of Saudi journalist 'can't be symbolic' 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 CollinsThe Kavanaugh debate was destructive tribalism on steroids: Here’s how we can stop it from happening again Conservative group launches ad campaign thanking Collins after Kavanaugh vote Democrats must end mob rule MORE (R-Maine), Al FrankenAlan (Al) Stuart FrankenFormer campaign aide to New Jersey governor says she was sexually assaulted by his ex-staffer Prosecutor drops some charges against Harvey Weinstein Poll: Dems maintain double-digit leads in Minnesota Senate races MORE (D-Minn.), Joe Lieberman (I-Conn.), Claire McCaskillClaire Conner McCaskillGOP Senate candidate: Kavanaugh 'debacle' 'hugely motivating' to Missouri voters Democrats hold fading odds of winning Senate this November Cornyn: 'All the money in the world' won't help O'Rourke win Texas MORE (D-Mo.) and Rob PortmanRobert (Rob) Jones PortmanElection Countdown: O'Rourke brings in massive M haul | Deal on judges lets senators return to the trail | Hurricane puts Florida candidates in the spotlight | Adelson spending big to save GOP in midterms How Kavanaugh got the votes  Collins to support Kavanaugh, securing enough votes for confirmation 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 ConnollyGerald (Gerry) Edward ConnollyVirginia Dem rips administration on Khashoggi Democrats see hypocrisy in GOP attacks on ‘liberal mob’ Oversight Dems call for probe into citizenship question on 2020 census 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.