Two lawmakers have proposed bipartisan legislation that would make it mandatory for tech companies to report any suspected terrorist activities to the appropriate authorities.

The bill was introduced in the Senate by two members of the Intelligence Committee, Vice Chairman Dianne Feinstein (D-California) and Chairman Richard Burr (R-North Carolina). They say it’s built on a law that requires companies to report child pornography if it’s found.

In a statement, the senators said the bill wouldn’t require the companies to monitor any of their customers or perform any new investigations to snuff out terrorists. But the senators said if the companies happen to discover any evidence of “terrorist activity” — things like planning attacks, recruiting terrorists or distributing material — they would be required to alert law enforcement.

Both senators said terrorist organizations have used social media to advance their cause.

“We’re in a new age where terrorist groups like (the Islamic State) are using social media to reinvent how they recruit and plot attacks,” Feinstein said. “That information can be the key to identifying and stopping terrorist recruitment or a terrorist attack, but we need help from technology companies.”

The senators said the idea was originally part of the annual intelligence authorization bill the Senate Intelligence Committee approved in June, but the mandatory reporting provision was removed. It’s now being introduced as a standalone bill after the husband-and-wife team of Syed Rizwan Farook and Tashfeen Malik killed 14 people and injured 21 more in a mass shooting last Wednesday in San Bernardino, California. President Barack Obama has denounced the shooting, which occurred during a holiday party for Farook’s coworkers, as an act of terrorism.

In reintroducing the legislation, the senators pointed to published media reports that said Malik declared allegiance to the leader of the Islamic State on Facebook around the time of the shooting. Authorities have yet to publicly confirm those published reports, though they have said they’ve discovered evidence the shooters were radicalized and had been for a period of time.

The investigation into the shooting continued as the senators urged Congress to pass the bill.

“It’s critical that Congress works together to ensure that law enforcement and intelligence officials have the tools available to keep Americans safe,” Burr said. “The stakes have never been higher and having cooperation with these outlets will help save lives here and abroad.”