The Guardian | Saeed Kamali Dehghan and Josie Le Blond: Donald Trump has warned America’s trading partners that anyone who does business with Iran will not be doing business with the US, after his administration reimposed blanket sanctions overnight.

The US president described the new sanctions, which hit Iran’s access to dollars, gold and precious metals, as “the most biting ever imposed”.

“In November they ratchet up to yet another level,” he tweeted. “Anyone doing business with Iran will NOT be doing business with the United States. I am asking for WORLD PEACE, nothing less!”

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