Actor Leonardo DiCaprio has nominated Prime Minister Stephen Harper to do the ice bucket challenge.
DiCaprio was in northern Alberta last week visiting the oilsands to do research for an environmental documentary.
The Oscar-nominated star of ``The Wolf of Wall Street'' posted a video on his Facebook page of him doing the ice bucket challenge with two First Nations chiefs.
Afterward, he called out Harper to do the same.
Harper's press secretary says the prime minister had been already challenged by others last week to either dump a bucket of ice water over his head or make a donation, and he's made a donation to the ALS Association.
The association raises money for Lou Gehrig's disease research and assistance.
DiCaprio has a long history of involvement with the environment. He sits on the boards of several international conservation organizations and started an environmental charity foundation in 1998.