As countries around the globe add armed drones to their arsenals, federal lawmakers are pressing the Biden administration to investigate how U.S. parts and technology ended up in what has fast become one of the most popular models on the world market: Turkey’s TB2.

Manufactured by the Turkish firm Baykar Technology, the TB2 can hover high above a battlefield and strike targets with laser-guided missiles. Baykar has maintained that the TB2s are domestically produced, with nearly all of the parts coming from within Turkey. But, as ProPublica reported this month, wreckage from downed drones in multiple conflicts has shown otherwise. A range of components were made by manufacturers in the U.S., Canada and Europe.

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To learn more, Rep. Tony Cárdenas, D-Calif., recently introduced an amendment to the House version of the National Defense Authorization Act. The annual budgeting bill is often an opportunity for lawmakers to require reports from the administration on pressing issues, and Cárdenas focused on the TB2, highlighting Azerbaijan’s deployment of the weapon in its 2020 war against neighboring Armenia over the disputed territory of Nagorno-Karabakh. Images of drone wreckage published by local media outlets and the Armenian military at the time showed parts that matched those made by several U.S.-based companies. Some of those firms told ProPublica they had taken steps to stop direct sales to Turkey, but others continue to sell key parts.

Read more: Propublica