The announcement was made on Fox Sports 1 during halftime of the international friendly between the USA and Venezuela. An official release with further detail was sent out by US Soccer moments later.
Dax McCarty, of course, is already with the USMNT for the Venezuela friendly tonight and for World Cup Qualifiers over the next week. The USA will host Trinidad and Tobago in Colorado on Thursday before traveling to face Mexico at the Estadio Azteca next Sunday.