Acting US homeland security secretary Chad Wolf resigns –as it happened

• Wolf, who called Capitol riot sickening', to step down at midnight
• Trump set to become first US president to be impeached twice
• Biden: Trump should not be in office. Period'
• House to begin debating article of impeachment on Wednesday
• Republicans block call for Pence to invoke 25th amendment

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Donald Trump has suffered yet another rebuke from a former ally, with the New England Patriots head coach, Bill Belichick, saying he will not accept the presidential medal of freedom.

Belichick, widely considered the greatest coach in NFL history, said he had made the decision after a Trump-inspired mob invaded the US Capitol last week. Trump was set to announce Belichick's award later this week.