"It's clear Labour, the Lib Dems and the SNP are now lining up to disrupt our Brexit negotiations in a coalition of chaos".
But addressing a hall in London packed with supporters, the beleaguered Corbyn denied a Conservative victory was a "foregone conclusion", pointing to his own unlikely election as Labour leader in 2015.
Sterling had spiked on the announcement of the general election on Tuesday but reversed its rally slightly yesterday, even as the House of Commons voted in favour of the plan.
The former interior minister, who became prime minister without an election when her predecessor David Cameron quit after last year's referendum, enjoys a runaway lead over the main opposition Labour Party in opinion polls.
However, Corbyn refused to say whether there would be a pledge for a second Brexit referendum in Labour's forthcoming manifesto, in response to journalists' questions following his speech. We have consistently demanded a meaningful vote in Parliament and as the government, will bring the deal we negotiate to Parliament before it is finalised to ensure democratic accountability.More news: House intel panel to hear from top officials on Russia probe
May, Britain's second female prime minister, also has strong popular support for her handling of the political natural disaster unleashed by Brexit.
The opposition Labour Party and Liberal Democrats welcomed the chance to put their policies to voters, though the Scottish National Party called the election a cynical political ploy.
"Labour is the party that will put the interests of the majority first".
He boasted about how he did not play by the rules set out by the Establishment and "their followers in the media".
May became prime minister without winning an election in July previous year following the resignation of David Cameron after millions of Britons went against his advice and voted to leave the EU.More news: Fresno shooting suspect due in court on murder charge
The Labour leader highlighted an analysis of Department for Education figures which showed more than 40,000 primary school children were taught in classes of 36 or more pupils in 2016, up from around 38,500 the previous year.
But they added the government was "not complacent about the situation in England" and said there was "more to do".
"He has not made clear how they would finance our two per cent commitment to North Atlantic Treaty Organisation and at every point he has voted against a stronger defence, including the renewal of Trident last July".
With Ms May seen winning a new five-year mandate and boosting her majority in parliament by perhaps 100 seats, the pound held close to six-and-a-half month highs on hopes she may be able to clinch a smoother, more phased departure from the European Union and minimise damage to the United Kingdom economy.
"Make no mistake, if the SNP wins this election in Scotland - and the Tories don't - then Theresa May's attempt to block our mandate to hold another referendum when the time is right, will crumble to dust", SNP leader and Scottish First Minister Nicola Sturgeon said.More news: Cuba Gooding Sr. found dead in his vehicle
But in a heated exchange before the vote in parliament Wednesday, Corbyn criticized May for her decision to not take part in any televised debates ahead of the June poll.
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