Catharine Tunney, Katie Simpson - CBC NewsCanada and the United States have agreed to restrict non-essential travel across the border as both countries try to slow the spread of the novel coronavirus — but they insist key supplies will still flow between the two nations. U.S. President Donald Trump first tweeted the news Wednesday morning. Soon afterward, Prime Minister Justin Trudeau held a news conference to announce that travellers will no longer be able to cross the border for recreational and tourism purposes. "These measures will last in place as long as we...…Catharine Tunney, Katie Simpson - CBC NewsCanada and the United States have agreed to restrict non-essential travel across the border as both countries try to slow the spread of the novel coronavirus — but they insist key supplies will still flow between the two nations. U.S. President Donald Trump first tweeted the news Wednesday morning. Soon afterward, Prime Minister Justin Trudeau held a news conference to announce that travellers will no longer be able to cross the border for recreational and tourism purposes. "These measures will last in place as long as we...WW…