Former astronaut Marc Garneau is expected to launch his bid today to become leader of the federal Liberals.
The Montreal MP has scheduled a news conference this morning in his home riding.
Garneau would join a crowded field that includes fellow Montreal MP, and leadership favourite, Justin Trudeau.
The 63-year-old Garneau was first elected to the House of Commons in 2008 and was re-elected in 2011.
The Quebec City native became the first Canadian in space when he flew aboard the Challenger shuttle in 1984.
Garneau served as president of the Canadian Space Agency from 2001 to 2005 before jumping into politics.