By Rodrigo Campos, David Alire Garcia and Marc Jones NEW YORK/MEXICO CITY/LONDON (Reuters) - The Mexican peso tumbled over 2% to its lowest in nearly three years against the dollar on Monday after the United States imposed 25% tariffs on its southern neighbor as part of the first major salvo of new global trade war.

The Mexican peso strengthened against the U.S. dollar after President Trump agreed to delay tariffs on Mexico by a month. The Canadian dollar also rebounded from session lows.