By Sarah Morland, Raul Cortes and Brendan O'Boyle MEXICO CITY (Reuters) - Mexican President Claudia Sheinbaum said on Wednesday Mexico would retaliate if U.S. President-elect Donald Trump followed through with his proposed 25% across-the-board tariff,

The president-elect said that he would impose the across-the-board tariffs on Day 1 and that they would stay in place until Canada, Mexico and China halted the flow of drugs and migrants.

Mexico said Wednesday the United States will be shooting itself in the foot if President-elect Donald Trump implements his threats to impose 25-percent tariffs on Mexican imports.He said he would charge 25 percent tariffs on Mexican and Canadian imports and 10 percent on Chinese goods "above any additional tariffs" on the world's second-biggest economy.