The president signed executive orders today offering a monthlong exemption, until April 2, for all goods covered under the U.S.-Mexico-Canada trade agreement, which includes most U.S. imports from those countries. About 10 percent of Mexico’s exports to the U.S. fall outside the U.S.M.C.A. trade agreement, according to one economist.

Former central banker Mark Carney won the race to become leader of Canada’s ruling Liberal Party and will succeed Justin Trudeau as prime minister. Carney will take over at a tumultuous time in Canada,