US President Joe Biden is heading to the US-Mexico border for the first time since he took office, as the country wrestles with a growing number of migrants. It comes just days after he announced an expansion of a public health measure known as Title 42, to block Cuban, Haitian and Nicaraguan migrants from illegally entering the US. That move has put him at odds with his own allies, who argue that approach goes against his campaign promises. Our Washington correspondent Simon Marks spoke to Charlotte Cook.
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