In January 1957, Diefenbaker took his place as Leader of the Official Opposition. In February, St. Laurent informed him that Parliament would be dissolved in April for an election on June 10. The Liberals submitted a budget in March; Diefenbaker attacked it for overly high taxes, failure to assist pensioners, and a lack of aid for the poorer provinces. Parliament was dissolved on April 12. St. Laurent was so confident of victory that he did not even bother to make recommendations to the Governor General to fill the 16 vacancies in the Senate.