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 RubioSenate Republicans tested on Trump support after Mueller Cuban negotiator says Trump's efforts to destabilize Cuba's government will fail Freedom to Compete Act would benefit many American workers 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 Republicans tested on Trump support after Mueller Collins: Mueller report includes 'an unflattering portrayal' of Trump GOP senator: 'No problem' with Mueller testifying MORE (R-Maine), Al FrankenAlan (Al) Stuart FrankenWinners and losers from first fundraising quarter Election analyst says Gillibrand doesn't have 'horsepower to go the full distance' Gillibrand campaign links low fundraising to Al Franken backlash: memo MORE (D-Minn.), Joe Lieberman (I-Conn.), Claire McCaskillClaire Conner McCaskillBig Dem names show little interest in Senate Gillibrand, Grassley reintroduce campus sexual assault bill Endorsements? Biden can't count on a flood from the Senate MORE (D-Mo.) and Rob PortmanRobert (Rob) Jones PortmanSenate Republicans tested on Trump support after Mueller GOP senator wears shirt honoring Otto Warmbier at Korean DMZ On The Money: Conservatives rally behind Moore for Fed | White House interviewing other candidates | Trump, Dems spar on Tax Day | Budget watchdogs bemoan 'debt denialism' 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 ConnollyBipartisan group asks DHS, ICE to halt deportations of Iraqi nationals Concerns mount over 2020 census The Hill's Morning Report - Trump vows to close US border with Mexico this week 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.