Canadian Prime Minister Justin Trudeau said months of intense negotiations between his country, the United States and Mexico imploded Tuesday when Vice President Pence demanded that any deal expire automatically in five years.

Trudeau said he was prepared to travel to Washington this week to try to finalize a rework of the North American Free Trade Agreement, but Pence, in the phone call, said a meeting would occur only if the “sunset” provision was agreed to in advance.

“I had to highlight that there was no possibility of any Canadian prime minister signing a NAFTA deal that included a five-year sunset clause, and obviously the visit didn’t happen,” Trudeau said Thursday.