In 1916, David Lloyd George forced Asquith to resign and replaced him as Prime Minister. Henderson became a member of the small War Cabinet with the post of Minister without Portfolio on 9 December 1916. The other Labour representatives who joined Henderson in Lloyd George's coalition government were John Hodge, who became Minister of Labour, and George Barnes, who became Minister of Pensions. Henderson resigned on 11 August 1917 after his proposal for an international conference on the war was rejected by the rest of the Cabinet.