U.S. President Donald Trump says his country’s legislators have to ratify the new North American free-trade deal before Mexico and Canada lose interest in finalizing it. The comments came as Trump and Prime Minister Justin Trudeau met in London Tuesday afternoon, on the sidelines of a summit of NATO leaders. Beforehand, Trump said he wouldn’t blame Trudeau or Mexico’s President Andres Manuel Lopez Obrador for walking away while the deal waits for a vote in the U.S. Congress.