The US President warns his forces will come to the rescue of peaceful Iranian anti-government demonstrators if they are targeted by Tehran. A senior adviser to Iran's supreme leader Ali Khamenei has responded by saying Donald Trump should know that US interference would lead to chaos across the region. Also: two French managers of the bar in the Swiss ski resort that suffered a deadly fire on New Year's Eve have been interviewed; new mayor Zohran Mamdani is formally sworn in in New York; the difficulty of not having a birth certificate in South Africa; Donald Trump gives an update about his health after concerns were raised; and what to look out for in space travel in 2026.

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