Labour leader says the Conservative Party is now the "political wing of the flat-Earth society".
But nine in 10 UK residents can still expect to pay more council tax.
He said the PM "has a responsibility to stop this slide into ever more toxic rhetoric".
The SNP chief said his position was "untenable" following last night's Commons chaos.
Debate overshadowed by furious row over Speaker Lindsay Hoyle.
Rishi Sunak also refuses to repeat Kemi Badenoch's claim that ex-Post Office chairman has been lying.
The move marks a change in the party's long-standing position on the conflict.
Labour leader calls for "ceasefire that lasts" ahead of Commons vote.
The prime minister was having a good week until all of a sudden he wasn't.
The results will pile even more pressure on Rishi Sunak.