A senior official with the Iran-backed Houthi rebels is warning countries against joining Saudi Arabia in Yemen’s revived civil war, telling The Associated Press on Sunday that his group has assured the Trump administration that it won’t attack U.S. vessels in the Red Sea.

Mohamed al-Bukhaiti, a member of the Houthis’ political bureau, said Washington reached out to the rebels after their rapid advance down Yemen’s western coast to the Bab el-Mandeb Strait earlier this month.