Prime Minister Mark Carney spoke to U.S. President Donald Trump for the first time since taking office, but it may not be him at the table after the federal election on April 28

"Canadians and other foreign nationals visiting the United States for periods longer than 30 days must be registered with the United States Government. Failure to comply with the registration requirement could result in penalties, fines, and misdemeanor prosecution," according to travel.gc.ca.

After the executive order, Canada updated its travel guidance for Canadians traveling to the U.S. to include information on the registration rule for visitors to the U.S. The new rule requires travelers to the U.

An abrupt announcement has rattled members of a little-known U.N. agency based in Jamaica that has protected deep international waters for more than 30 years.

Many European nations and Canada have issued or updated travel advisories for visiting the US. Fewer visits could mean billions in lost spending too.

Weaponizing energy trade between the U.S. and Canada broke with decades of cooperation—and might set a troubling precedent for energy diplomacy in North America.

Several airlines have reduced the number of seats on U.S.-bound flights in April, while industry data shows that bookings have declined significantly.

American automakers have relied on labor from neighbors to the north and south since the early days of auto production in North America.