The U.S. government is continuing to advocate for the Patriot missile defense system offered by Raytheon Co and Lockheed Martin Corp in a Turkish tender after Turkey cited disagreements with the Chinese firm that initially won the bid, a senior U.S. official said on Wednesday.

“We’re in regular contact with the Turks about the U.S. offer in this particular competition,” Gregory Kausner, deputy assistant secretary of state for regional security and security assistance, told the Reuters Aerospace and Defense Summit.

U.S. and NATO officials had warned Turkey that its collaboration with China on the system could raise questions about the compatibility of weaponry and of security. […]