As a backbencher, he became the leader of Liberals opposed to the government of Rutherford's successor, Arthur Sifton, until Sifton re-appointed him Attorney-General in 1912. Cross served in this capacity under Sifton and his successor Charles Stewart until 1918, when Stewart fired him after receiving no response to his request for Cross's resignation. Cross remained in provincial politics until 1925, but in a radically diminished role. After leaving provincial politics, he was elected to the Canadian House of Commons, only to be defeated in his 1926 re-election bid. He died in 1928.