'We must resist becoming numb': Biden marks 500,000 Covid deaths with national address – as it happened

• President addresses grief: I know what it's like'
• US coronavirus death toll passes 500,000
• Merrick Garland emphasizes DOJ independence: I am not the president's lawyer'
• Biden to order flags be flown at half-staff for coronavirus victims
• Dominion Voting to sue MyPillow CEO for defamation
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12.59am GMT

We are wrapping up our live US politics coverage for tonight, but you can continue to get updates from my colleague Helen Sullivan on our global coronavirus blog.

Key events from today, updated from our earlier coverage:

12.55am GMT

Small study finds teachers, more than students, driving Covid infections at school

From the Associated Press: