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 RubioPompeo: Countries must 'step up,' provide 'transparent' coronavirus information to save lives China did not count coronavirus positives if patient had no symptoms: report Trump seeks to sell public on his coronavirus response 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 CollinsGOP presses for swift Ratcliffe confirmation to intel post Campaigns pivot toward health awareness as races sidelined by coronavirus Senate eyes quick exit after vote on coronavirus stimulus package MORE (R-Maine), Al FrankenAlan (Al) Stuart FrankenAl Franken blasts Susan Collins: She'll let Trump 'get away with anything' Bill Press: Don't forget about Amy Key moments in the 2020 Democratic presidential race so far MORE (D-Minn.), Joe Lieberman (I-Conn.), Claire McCaskillClaire Conner McCaskillGOP lukewarm on talk of airline bailout Claire McCaskill: Ron Johnson is an 'embarrassing tool' To winnow primary field, Obama and other Democrats must speak out  MORE (D-Mo.) and Rob PortmanRobert (Rob) Jones PortmanGOP senator to donate 2 months of salary in coronavirus fight Senators pen op-ed calling for remote voting amid coronavirus pandemic Some Democrats growing antsy as Senate talks drag on 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 ConnollyOPM chief abruptly resigns The Hill's Morning Report - Presented by the APTA - Biden looks for Super Tuesday surge; coronavirus fears heighten 'Liberated' Pelosi bashes Trump — and woos Democratic base 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.