According to an interview roundup released by the White House, U.S. Secretary of Transportation Sean Duffy stated that Congress has provided $12.5 billion in partial funding, restricted for use on radar, radio, and related upgrades, which does not cover the requirements for new telecommunications networks, software, and towers. He called on Congress to make up the shortfall for modernization funding; existing materials did not specify the additional amount needed, nor did they indicate that additional appropriations have been approved. Duffy further noted that a network overload occurred during the migration of Eldorado copper lines to fiber-optics and the connection of routers, and related investigations remain in the preliminary stage.