Canada should use federal powers to ease the growing economic disruption caused by the blockage of a vital U.S.-Canada trade route by protesters opposed to coronavirus mandates, U.S. President Joe Biden’s administration said on Thursday.

The closure of the Ambassador Bridge, North America’s busiest international land border crossing and a vital supply route for Detroit’s carmakers, has halted some auto output and left officials scrambling to limit economic damage…

Canadian federal ministers have called the blockade illegal and asked protesters to return home.

In a tweet on Thursday, Canadian Prime Minister Justin Trudeau said he had spoken to Drew Dilkens, the mayor of Windsor, Ontario, which borders Detroit, and said the federal government was ready to help Windsor and the province get the situation under control.

“It is causing real harm to workers and economies on both sides of the border,” he said.