US Secretary of State Marco Rubio attends a cabinet meeting at the White House in Washington, DC, US, April 10, 2025. Photo: REUTERS/Nathan Howard
A bipartisan coalition of more than 40 US lawmakers is pressing Secretary of State Marco Rubio to prevent Turkey from rejoining the F-35 Joint Strike Fighter program, citing ongoing national security concerns and violations of US law.
Members of Congress on Thursday warned that lifting existing sanctions or readmitting Turkey to the US F-35 fifth-generation fighter program would “jeopardize the integrity of F-35 systems” and risk exposing sensitive US military technology to Russia. The letter pointed to Ankara’s 2017 purchase of the Russian S-400 surface-to-air missile system, despite repeated US warnings, as the central reason Turkey was expelled from the multibillion-dollar fighter jet program in 2019.
“The S-400 poses a direct threat to US aircraft, including the F-16 and F-35,” the lawmakers wrote. “If operated alongside these platforms, it risks exposing sensitive military technology to Russian intelligence.”
The group of signatories, spanning both parties, stressed that Turkey still possesses the Russian weapons systems and has shown “no willingness to comply with US law.” They urged Rubio and the Trump administration to uphold the Countering American Adversaries Through Sanctions Act (CAATSA) and maintain Ankara’s exclusion from the F-35 program until the S-400s are fully removed.
The letter comes after Turkish President Recep Tayyip Erdogan claimed during a NATO summit in June that Ankara and Washington have begun discussing Turkey’s readmission into the program.
Lawmakers argued that reversing course now would undermine both US credibility and allied confidence in American defense commitments. They also warned it could disrupt development of the next-generation fighter jet announced by the administration earlier this year.
“This is not a partisan issue,” the letter emphasized. “We must continue to hold allies and adversaries alike accountable when their actions threaten US interests.”
