In 1966 he was expelled from the party for trying to promote an abortion bill through the Knesset. So together with two others, he formed the Free Centre in 1967. Tamir was re-elected in 1969, and again in 1973, by which time his party had merged into Likud. He resigned from the Knesset in January 1977 to form the Shinui Party, which failed and very soon broke up. Immediately afterwards he decided to join the new centrist party, the Democratic Movement for Change (Dash). He was returned to the Knesset in the 1977 elections on Dash's list, and was appointed Minister of Justice in the Begin government on 24 October. As Dash disintegrated, Tamir joined the Democratic Movement, before leaving to sit as an independent MK (member of the Knesset). He resigned from the cabinet on 5 August 1980 when his party was frozen out of coalition decision-making. At the ensuing 1981 election he lot his seat.