PALM BEACH, Fla. -- Former prime minister Brian Mulroney apparently sang to U.S. President Donald Trump at the Mar-a-Lago in Florida Saturday night.

A video posted on social media that appeared to be taken from a fundraising event shows Mulroney singing "When Irish Eyes are Smiling" on the stage at the Mar-a-Lago club.

Canadian songwriter David Foster was headlining the fundraiser for the Dana-Farber Cancer Institute at the Mar-a-Lago, which Trump has called the "winter White House."

"I would never presume to say that I could go to the president of the United States and ask him to sing, so I won't do that," Foster joked before calling Mulroney to the stage.

The Palm Beach Daily News said that Mulroney had been sitting with Trump and his wife Melania, who are his longtime neighbours in Palm Beach, Fla.

"Mr. President, I hope this doesn't fracture U.S.-Canada relations for decades," Mulroney quipped in Saturday's video shortly before he started singing.

But Saturday wasn't the first time Mulroney sang "When Irish Eyes are Smiling" in the presence of an American president.

He and his wife Mila joined Ronald Reagan and his wife Nancy in singing the song during a meeting in Quebec City in 1985 that was then dubbed the "Shamrock Summit."

Representatives for Dana-Farber, Mulroney and Foster did not immediately respond to requests for comment.