Newly appointed Canadian Prime Minister Mark Carney delivered a firm message to former U.S. President Donald Trump during a high-profile meeting at the White House on Tuesday, May 6: “Canada is not for sale.”

The meeting, though diplomatically cordial, underscored the sharp differences between both leaders, particularly as Trump once again floated the provocative idea of Canada becoming the 51st state of the United States an idea he has suggested publicly on several occasions.

“It takes two to tango, right?” Trump remarked. “We’re not going to be discussing that unless somebody wants to discuss it.” He likened the potential merger to a “wonderful marriage,” leaving the possibility open for future discussions.

Carney, however, quickly dismissed the notion. “There are some places that are never for sale,” he said, drawing comparisons to globally revered institutions like the White House and Buckingham Palace.

While the two leaders found common ground on issues such as Canada’s increased military commitments something Trump acknowledged positively the former U.S. president ended the meeting with his trademark ambiguity: “Never say never.”