‘No sign Putin is serious’ about Ukraine negotiations, says Blinken – as it happened

• Senators question secretary of state
• Kamala Harris tests positive for Covid
• White House unveils latest Covid-19 strategies
• Supreme court justices hint at support for Biden immigration policy
• Russia-Ukraine war - follow live updates
• Sign up to receive First Thing - our daily briefing by email

The vice-president Kamala Harris has tested positive for Covid-19, her office has announced.

A statement from Harris's press secretary Kirsten Allen said:

Today, vice-president Harris tested positive for Covid-19 on rapid and PCR tests. She has exhibited no symptoms, will isolate and continue to work from the vice-president's residence.

She has not been a close contact to the president or First Lady due to their respective recent travel schedules. She will follow CDC guidelines and the advice of her physicians. The vice-president will return to the White House when she tests negative.