President Trump threatens to double tariffs on Mexico over illegal immigration into the US

12 November 2026

President Trump threatens to double tariffs on Mexico over illegal immigration into the USBillion Photos/Shutterstock.com

President Trump has threatened to double tariffs on Mexico “immediately” if illegal immigration into the US from Mexico does not end, on his social media platform Truth Social.

President Trump has not stated the legal authority he would use to impose these tariffs. The US Supreme Court ruled in February 2026 that the International Emergency Economic Powers Act (see our US legislation page) does not authorise the President to impose tariffs.

Maya Lester KC

Maya Lester KC is a senior barrister (King’s Counsel) at Brick Court Chambers with a wide-ranging practice in public law, European law, competition law, international law, human rights & civil liberties. She has a particular expertise in sanctions. She is the…

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