Top US border official asked to resign

Customs and Border Protection Commissioner Chris Magnus tasked with overseeing US border security says he has been asked to resign or be fired by the homeland security secretary.

Mr Magnus has refused to do so and has defended his work with the federal agency.

The number of illegal crossings at the US-Mexico border reached a record high this year, prompting heavy criticism.

He has been commissioner of the federal agency for less than a year.