Which part of the government has the authority to set foreign and domestic policy

The Conservative Party Government of Canada led by Prime Minister Stephen Harper moved away from the multilateral and internationalist policies of the Liberal Party, and reduced Canada's emphasis on the United Nations, which was seen as dominated by corrupt dictatorships. In parallel, Harper sought to strengthen cooperation with the US, particularly in the era of mass terrorism and instability. As part of this policy, his government continued and expanded Canada's participation in the US-led anti-terror campaign in Afghanistan, which began following al Qaida's mass attacks on September 11, 2001, and in the Iraq conflict that began under President George W. Bush in March 2003. In addition, under the Harper governments and through the actions of Foreign Affairs Ministers Peter MacKay and John Baird, Canada developed a leadership position in developing a principled alternative to the United Nations, involving the participation of the world's open and democratic countries.

Idon't understand ur ?