Live updates: Milley, Austin and McKenzie to testify before Congress on Afghanistan, China

 The nation's top military leaders will face lawmakers on Capitol Hill on Tuesday in a hearing expected to touch on some of the most contentious national security challenges facing the country.

Joint Chiefs of Staff Chairman Mark Milley, Defense Secretary Lloyd Austin and U.S. Central Command Gen. Kenneth McKenzie will testify before the Senate Armed Services Committee on Tuesday and House Armed Services Committee on Wednesday.

The trio is expected to be grilled on their handling of the U.S. withdrawal from Afghanistan, competition with rivals like China, and, in Milley's case, reports that he may have circumvented his...