London Mayor Boris Johnson has confirmed he will be seeking re-election for a second term.
The former Tory MP said he wanted to stay on beyond May 2012 because he had "more to do" improving the capital and overseeing the Olympics.
Labour is set to decide whether former mayor Ken Livingstone or ex-MP Oona King will be its candidate for the post later this month.
Mr Livingstone urged voters to punish Mr Johnson for the coalition's assault on public spending and welcomed his re-election bid "because he now has a record that means he can be held to account.
"Johnson cannot escape the fact that he has pioneered huge cuts in London and he vigorously campaigned for his Tory colleagues to win the general election, knowing full well the economic policy they would deliver and the damage they would do to policing and transport.
"The government's cuts are his cuts."
Mr Johnson is set to be officially endorsed as the Tory candidate next month.
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