Jeremy Corbyn has demanded that Theresa May reveal full details of the government's plans for Brexit "without delay" after the High Court ruled the government cannot trigger Article 50 without the approval of MPs.
But he refused to say whether he would welcome an early election, accusing the media of "harrassing" him with the single question directed to him on the matter.
In a speech to thinktank Class on Saturday, the Labour leader demanded "transparency and accountability to Parliament".
He also said that British businesses need clarity as opposed to private 'sweetner' assurances given behind closed doors such as that given to Japanese car-maker Nissan.
But afterwards, he dodged a single question posed by ITV News political correspondent Libby Wiener asking whether he would welcome a new general election - with an aide trying to block the camera before accusing her of being "rude".
Mrs May has so far kept her cards close to her chest, saying that she does not want to put Britain at a disadvantage by revealing its stance ahead of formal talks on the terms of the UK's departure.
However, there have been claims that Government is still trying to formulate their policy while officials are also struggling to get to grips with the unprecedented challenge of making a clean exit from the bloc.
Mr Corbyn also insisted that all UK businesses should be given "assurances" over the impact of Brexit to match those given to Japan's Nissan before its announcement of new investment in Sunderland.
"We can't have secret deals on Brexit, company by company," Mr Corbyn said.
"All our businesses need the kind of assurances that Nissan has had about the shape of the Government's Brexit plans to make the right investment decision."
His calls add to pressure on Mrs May, who is also facing an internal revolt from some of her own MPs who have said the reaction from the High Court decision has been bordering on "fascist".
Meanwhile, the pro-Brexit Conservative MP Stephen Phillips resigned on Friday because of "irreconcilable policy differences with the current Government" after Mrs May indicate she would be seeking a so-called "hard Brexit".