President Trump has made the unconventional decision to share his cellphone number with at least three foreign leaders, according to a report Tuesday.

Both Canadian Prime Minister Justin Trudeau and Mexican President Enrique Pena Nieto have been given Trump's contact information, and Trump has swapped numbers with French President Emmanuel Macron, unnamed officials told the Associated Press.

Only Trudeau has used Trump's number so far, the report added.

Trump's decision to dole out his digits poses security and secrecy risks as presidents usually use a secure line to make phone calls.

"If you are speaking on an open line, then it's an open line, meaning those who have the ability to monitor those conversations are doing so," Derek Chollet, a former Pentagon adviser and National Security Council official at the German Marshall Fund of the United States, told the AP.

Chollet said that if someone is trying to spy on Trump's phone conversations, then "you have to presume that others are listening to it."

Neither the White House nor Trudeau's office responded to the AP's request for comment.