Jeremy Corbyn will accuse Boris Johnson of “using the Queen” for pre-election political purposes when Parliament reopens next week.
Following a week’s suspension, a new parliamentary session will begin on Monday with a state opening and Queen’s speech.
But the Labour leader is set to brand the ceremony a “cynical stunt”.
Mr Corbyn, who has been accused of “running scared” from a general election, will insist he is “champing at the bit” for a poll, but would only back one if a no-deal Brexit is taken off the table.
The Prime Minister is legally bound to seek a Brexit extension if he does not secure a deal or no deal exit by October 19 – but his opposition counterpart has said Mr Johnson “can't be trusted not to break the law”.
Speaking in Northampton today, Mr Corbyn will say: “On Monday, we will be treated to the farce of Boris Johnson's Conservative government, amid full pomp and ceremony, setting out an agenda to Parliament that it has no intention or means of delivering.
“Holding a Queen's Speech before an election is a cynical stunt.
“Johnson is using the Queen to deliver a pre-election party political broadcast for the Conservative Party.”
Meanwhile, Mr Johnson will embark on last-ditch Brexit talks with Irish leader Leo Vadkar today, as securing a deal by next week’s crucial EU summit in Brussels appears increasingly unlikely.
The Prime Minister will be looking to negotiate concessions on the issue of the Northern Ireland border, which continues to be a sticking point.