A group of House Democrats has introduced a bill that would formalize a policy of the United States not sharing cyber intelligence with Russia.

The proposed law is a direct response to comments President Donald Trump made earlier this week after he met with Russian President Vladimir Putin. After the meeting, Trump said on Twitter that he and Putin had discussed forming an “impenetrable Cyber Security unit” to prevent future attacks, including election hacking. The idea was roundly criticized by security and foreign policy experts and within a few hours Trump walked it back, saying it was just an idea and couldn’t actually happen.

“Simply put, we would be inviting the fox into the hen house.”

But some legislators are not taking the idea of information sharing with Russia as a hypothetical. On Wednesday, Rep. Ted Lieu (D-Calif.), Rep. Brendan Boyle (D-Pa.), and Rep. Ruben Gallego (D-Ariz.) introduced the No Cyber Cooperation With Russia Act to ensure that the U.S. doesn’t hand over any cybersecurity intelligence on attacks or vulnerabilities to Moscow. Recent attacks such as the NotPetya malware outbreak have been linked to Russia, as have the various attacks surrounding the 2016 presidential election.

“When the Russians get their hands on cyber intelligence, they exploit it – as they did last month with the NotPetya malware attack targeting Ukraine and the West. It is a sad state of affairs when Congress needs to prohibit this type of information sharing with an adversary, but since we apparently do, I am proud to introduce the No Cyber Cooperation with Russia Act with my friends Brendan Boyle and Ruben Gallego. I urge my colleagues across the aisle to join us in sending a clear message that Congress will not stand for this proposal to undermine U.S. national security,” Lieu said in a statement.

The bill would prohibit the U.S. from getting involved in any working group on cybersecurity issues that includes Russia.

“Simply put, we would be inviting the fox into the hen house,” Gallego said.