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President Donald Trump speaks at Morristown Municipal Airport in Morristown, N.J., on his way returning back to the White House, Sunday, July 7, 2019. Image Credit: AP

Morristown, New Jersey: US President Donald Trump on Sunday said Iran “better be careful,” hours after Tehran announced it would shortly boost its uranium enrichment above a cap set by a landmark 2015 nuclear deal.

Speaking to reporters as he departed Morristown, New Jersey for Washington DC, Trump also took aim at the British Ambassador to the US, Kim Darroch, saying he did not serve the United Kingdom well, after a news report alleged he criticized Trump administration in a series of confidential memos.