In a speech that is at odds with the stance of Labour's leader Jeremy Corbyn, Watson will say there is "no such thing as a good Brexit deal" and Labour must campaign unequivocally to remain, the BBC said.
The Government immediately announced it was lodging an appeal against the ruling with the Supreme Court, with a hearing set for Tuesday, but opposition MPs said the prorogation should be set aside without delay so ministers could be held to account for their Brexit plans in the Commons. "We stand for the interests of the many - the overwhelming majority who do the work and pay their taxes - not the few at the top who hoard the wealth and dodge their taxes".
Labour leader Jeremy Corbyn has said he is "eager for an election" but wants to see legislation created to stop a no-deal Brexit on 31 October implemented first. In return, he would let pro-Brexit Conservatives run unopposed, boosting their chances of being elected.
Boris Johnson has sought to shore up support for his Brexit ambitions, as Labour's deputy leader prepared to call for a second referendum before any general election.
"After that we want a general election so the people of this country can decide their future, giving everyone a government that invests, that ends austerity, that deals with the grotesque levels of inequality and poverty".
'He wants to stage a showdown over a no-deal Brexit that he can package as a battle between parliament and the people, ' Jeremy Corbyn said.
"Even at this 11th hour we think there is time to do it, ' said Labour's Stephen Kinnock as he joined Tory MPs at the launch of the 'MPs for a Deal" group.
Its election manifesto will promise to reach a better Brexit deal, but is not expected to commit to either Leave or Remain.
But Mr Johnson later dismissed as a "load of nonsense" accusations that suspending Parliament is "anti-democratic", insisting it was necessary to prorogue before the Queen's Speech.
However, the prime minister hasn't bitten on the offer, with word coming from his spokesman at lunchtime on Wednesday that he wouldn't be doing a deal with Farage.
But 46% agreed they are "fearful" of the consequences of a no-deal Brexit while 33% disagreed and 21% answered "don't know".
Asked about the thought of Mr Johnson's consultant Dominic Cummings, Mr Farage laughed and mentioned his remarks had been "petty".
The poll was conducted between September 6 and 8, with 2,016 British adults surveyed.
Former attorney general Dominic Grieve's demand for all written and electronic contact about the temporary suspension of Parliament and Operation Yellowhammer documents since July 23 to be released was approved by 311 votes to 302 on Monday.
'We see this right through Government, right through the judiciary'.