Elizabeth Callaghan: UK correspondent on Donald Trump calling for NATO nations to increase their defence spending - Heather du Plessis-Allan Drive

The US says the UK and all other NATO allies must agree to spend at lest 5 percent of national income on defence and security 'starting now'.

Matthew Whitaker, Donald Trump's ambassador to the NATO alliance, made this statement earlier, and claimed these nations needed to make a 'commitment'.

UK correspondent Elizabeth Callaghan explains further.

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