Mr. Speaker, allow me to quote Postmedia on June 6, 2013:
Liberal Party spokesperson Kate Monfette said the party pays for expenses for its leader that are “strictly partisan in nature” and unrelated to parliamentary duties “so as to ensure the separation between parliamentary activities and political activities.”
That is precisely what the Conservative Party of Canada does. When the Prime Minister has exclusively partisan expenses, they are paid by the Conservative Party of Canada fund, which is controlled by the Conservative Party itself.