The Honourable Maxime Bernier, PC
Founder and leader of the
People's Party of Canada
Question:
Can still be referred to as "The Honourable Maxime Bernier, PC."
Answer:
This is because the title "Honourable" is carried for life by members of the King's Privy Council for Canada, and they also use the initials "P.C."


The provided context confirms:
Maxime Bernier served as a Cabinet minister in the Harper government, which included roles such as Minister of Industry, Minister of Foreign Affairs, and Minister of State.3 Serving in the federal Cabinet grants membership in the King's Privy Council for Canada.
The title "Honourable" is carried for life by Privy Councillors.
Maxime Bernier is explicitly listed as a member of the King's Privy Council for Canada, having been sworn in in 2006.
He is also frequently referred to as "The Honourable Maxime Bernier" and with the post-nominal letters "PC" in various sources, including his Wikipedia entry and on the Parliament of Canada website.
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