who serves as head of their political party
Party leader In politics, a party leader is the most powerful official within a political party.[1] The leader speaks to their designated political party, while acting as the party representatives. The party leader is typically responsible for managing the party's relationship with the general public. As such, he or she will take a leading role in developing and communicating party policy, especially election platforms, to the electorate. He or she is also typically the public face of the party and the principal media contact.
Leader of the Official Opposition (Canada) The Leader of Her Majesty's Loyal Opposition (French: Chef de la loyale opposition de Sa MajestÃ©) is the leader of Canada's Official Opposition, the party possessing the most seats in the House of Commons but is not the governing party or part of the governing coalition. The current Leader of the Opposition is Andrew Scheer, M.P., who was elected Leader of the Conservative Party on May 27, 2017.