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 RubioRubio heckled by protestors outside immigration detention facility Bill to protect work licenses of student loan debtors is welcome development Political figures pay tribute to Charles Krauthammer 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 Gang of Four to meet next week on immigration Republicans agree — it’s only a matter of time for Scott Pruitt Skyrocketing insulin prices provoke new outrage MORE (R-Maine), Al FrankenAlan (Al) Stuart FrankenThe Hill's Morning Report — Sponsored by PhRMA — GOP lawmakers race to find an immigration fix Richard Painter puts out 'dumpster fire' in first campaign ad Bill Clinton says 'norms have changed' in society for what 'you can do to somebody against their will' MORE (D-Minn.), Joe Lieberman (I-Conn.), Claire McCaskillClaire Conner McCaskillNail manufacturing exec who voted for Trump blames him for layoffs, asks Democrat for help The American economy is stronger than ever six months after tax cuts The Hill's Morning Report — Sponsored by PhRMA — Immigration drama grips Washington MORE (D-Mo.) and Rob PortmanRobert (Rob) Jones PortmanSenate moving ahead with border bill, despite Trump 13 GOP senators ask administration to pause separation of immigrant families Lawmakers, businesses await guidance on tax law 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 ConnollyLawmakers, media serve up laughs at annual 'Will on the Hill' Overnight Energy: Trump praises Pruitt for doing 'great job' | Lawmakers want criminal probe of Pruitt | Heckler brings lotion bottle to Pruitt speech Lawmakers call for criminal investigation into EPA chief 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.