Alberta Conservative MP Rona Ambrose made it official on Tuesday.
After 13 years as a federal MP, she is stepping down effective immediately.
Ambrose served as interim leader for the Conservatives after Stephen Harper stepped down after the party lost the last federal election giving way to Regina MP Andrew Scheer who won a leadership convention earlier this year.
In a letter put on her Twitter account, Ambrose states “It has been the greatest privilege of my life serving as a Member of Parliament, Minister, and Leader of the Official Opposition over the last 13 years.”
The letter does not say what she will do next.