US Defense Secretary Lloyd Austin speaks to Defense Department personnel during a visit by US President Joe Biden at the Pentagon in Arlington, Virginia, US, February 10, 2021. Photo: REUTERS/Carlos Barria/File Photo

The chairman of the Senate Foreign Relations Committee, Bob Menendez, said on Tuesday he was disappointed US Defense Secretary Lloyd Austin did not agree to testify at a committee hearing on Afghanistan and he may subpoena him and others to do so.