MEXICO CITY — President Claudia Sheinbaum suggested Tuesday that Mexico could retaliate with tariffs of its own, after U.S. President-elect Donald Trump threatened to impose 25% import duties on Mexican goods if the country doesn’t stop the flow of drugs and migrants across the border. [time-brightcove not-tgx=”true”] Sheinbaum said she was willing to engage in talks on the issues, but said drugs were a U.S.