The Trump administration is close to striking a deal with Mexico on a revamped North American Free Trade Agreement, analysts said, but thorny issues are yet to be resolved with Canada, the third party in the trilateral pact. Reaching an agreement with Mexico would mark a breakthrough for the administration after a year of roller-coaster talks and tension with its longtime North American trading partners. President Trump has frequently threatened to withdraw from NAFTA, linked the renegotiations to his call for a wall along the U.S.-Mexican border and slapped tariffs on Mexican and Canadian steel to apply pressure to make...