Key House lawmakers announced their bill Friday to bar the sale of the F-35 warplane to Turkey if Ankara buys the Russian S-400 surface-to-air missile system.

The bipartisan trio of senior House Armed Services Committee members — Reps. Mike Turner, R-Ohio; John Garamendi, D-Calif., and Paul Cook, R-Calif., sponsored the bill, a companion to a bipartisan bill from Sen. James Lankford, R-Okla., and others. Both bills are called the “Protecting NATO Skies Act of 2019.”

“Operating the S-400 alongside the F-35 would compromise the aircraft and its sensitive technology, impact interoperability among NATO allies, and most importantly pose serious risk to our shared defense and security,” Garamendi said in a statement. “This bill sends a strong and important message to Turkey — proceeding with the S-400 is unacceptable and will not be tolerated.”

The House bill came days after Turkish President Recep Tayyip Erdogan reportedly discussed with U.S. President Donald Trump a Turkish proposal to establish a joint committee over Turkey’s plans to purchase the S-400.

A statement from Erdogan’s office says the two leaders held a telephone conversation on Monday during which they also discussed the fight against terrorism and efforts to increase trade.

U.S. officials say the Russian defense system could pose a threat to the F-35 program and have warned of consequences if the purchase is finalized.

Turkey denies that the system is a threat and has proposed a joint committee to review security risks.

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