The Government has so far been defeated three times in the House of Lords this evening - and may well be defeated on several more votes.
Peers are voting on amendments to the controversial secret court legislation. The Justice and Security Bill allows more cases to be held in secret without claimants being able to hear the evidence against them.
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Andreea Cristea, 29, remains in a critical condition after being rescued from the Thames after a terror attack along Westminster Bridge.
The Prime Minister has praised the former soldier's "huge professionalism" in trying to save the life of Pc Keith Palmer.
The man who carried out the Westminster attack is thought to be British born and was once investigated by MI5, the Prime Minister has said.