WASHINGTON (Reuters) - U.S. lawmakers are pushing legislation that would force the State Department to report what it is doing to control the spread of U.S. hacking tools around the world.

A man types on a computer keyboard in front of the displayed cyber code in this illustration picture taken on March 1, 2017. REUTERS/Kacper Pempel/Illustration

A bill passed in a House of Representatives’ appropriations subcommittee on Tuesday said Congress is “concerned” about the State Department’s ability to supervise U.S. companies that sell offensive cybersecurity products and know-how to other countries.

The proposed legislation, released on Wednesday, would direct the State Department to report to Congress how it decides whether to approve the sale of cyber capabilities abroad and to disclose any action it has taken to punish companies for violating its policies in the past year.

National security experts have grown increasingly concerned about the proliferation of U.S. hacking tools and technology.

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The legislation follows a Reuters report in January which showed a U.S. defense contractor provided staff to a United Arab Emirates hacking unit called Project Raven. The UAE program utilized former U.S. intelligence operatives to target militants, human rights activists and journalists.

State Department officials granted permission to the U.S. contractor, Maryland-based CyberPoint International, to assist an Emirate intelligence agency in surveillance operations, but it is unclear how much they knew about its activities in the UAE.

Under U.S. law, companies selling cyber offensive products or services to foreign governments must first obtain permission from the State Department.

The new measure was added to a State Department spending bill by Dutch Ruppersberger, a Democrat from Maryland and member of the House Appropriations Committee.

Ruppersberger said in an emailed statement he had been “particularly troubled by recent media reports” about the State Department’s approval process for the sale of cyberweapons and services.

CyberPoint’s Chief Executive Officer Karl Gumtow did not respond to a request for comment. He previously told Reuters that to his knowledge, CyberPoint employees never conducted hacking operations and always complied with U.S. laws.

The State Department has declined to comment on CyberPoint, but said in an emailed statement on Wednesday that it is “firmly committed to the robust and smart regulation of defense articles and services export” and before granting export licenses it weighs “political, military, economic, human rights, and arms control considerations.”

Robert Chesney, a national security law professor at the University of Texas, said the Reuters report raised an alarm over how Washington supervises the export of U.S. cyber capabilities.

“The Project Raven (story) perfectly well documents that there is reason to be concerned and it is Congress’ job to get to the bottom of it,” he said.

The bill is expected to be voted on by the full appropriations committee in the coming weeks before going onto the full House.