And while there has not been any confirmation from either camp on whether or not it will happen for sure, in the meantime, you can check out their original 2015 duet below:ContentView Iframe URLRelated: 2,000 to 6,000 people were expected to show up, leading the Southern Poverty Law Center to say it could be the "largest hate-gathering of its kind in decades in the United States." a progressive advocacy organization that monitors the media. Canadian Prime Minister Justin Trudeau mourned the loss. "Canada strongly condemns the senseless attack that took place last night in London, United Kingdom, which killed and injured many innocent people," the statement read. "I am heartbroken that a Canadian is among those killed. We grieve with the families and friends of those who have lost loved ones, and wish all those injured a speedy and full recovery."