BP's chairman has been asked to attend the White House next week to meet President Obama and other US officials.

The company is coming under increasing pressure from the American administration as the extent and severity of the oil spill in the Gulf Coast becomes clearer.

It is thought the amount of crude oil that has leaked into the water could be double previous estimates.

The increasingly hostile rhetoric in the US against the British oil company has led to Britain's Prime Minister David Cameron confirm he will be talking to President Obama over the weekend.

Matt Prodger reports.

READ MORE: BP spill 'double early estimates'