He told CBC’s “The Current” what’s happened over the last four years has been “anomalous."
Many have encouraged him to join the race.
The move has allegedly been in the works for months.
The former prime minister has been a vocal critic of the Iranian regime.
From Jack Layton's passing to the stunning attack on Parliament Hill.
In 2009, Canada was called the “dirty old man of the climate world.” What’s changed?
The former president also said despite having "very different" politics from Harper, they managed to get things done.
He warned of the rise of Russia and China amid an era of eroding U.S. leadership.
Stephen Harper's election campaign marked a turning point.
The former cabinet minister has denied he wants to replace Scheer as Tory leader.