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The Trump administration is trying to cut Venezuelan president Nicol谩s Maduro's revenue streams, US National Security Adviser John Bolton says.

The comments come one day after Mr Maduro cut diplomatic ties with the US.

Also on the programme: we look at the big business of homemade guns in the West Africa region; and the science of who, how and why we fall in love.

(Photo: Venezuelan protester holds up a placard that reads We Have a Free Venezuela. Credit: AFP)