Boris Johnson and Jeremy Corbyn have traded barbs as the PM prepares to officially launch the Tory general election campaign.
The PM likened his Labour counterpart to Soviet dictator Joseph Stalin, words which Mr Corbyn branded as "nonsense" in a late night tweet.
Mr Johnson, writing in the Telegraph, said Mr Corbyn has taken a stance that demonises billionaires with a "relish and a vindictiveness", which he compared to Stalin's attitude towards landowners following the Russian revolution.
Mr Corbyn tweeted a copy of the front page the PM's words appeared on and wrote: "The nonsense the super-rich will come out with to avoid paying a bit more tax..."
On Wednesday, the PM is expected to visit Buckingham Palace for an audience with the Queen before launching the Conservative's election campaign in the West Midlands.
Mr Johnson is expected to say: "There is only one way to get Brexit done, and I am afraid the answer is to ask the people to change this blockading parliament."
"It's time to change the dismal pattern of the last three years and to get out of our rut."
He will then turn to specifics on areas he wishes to target with his policies, before descending into criticisms of Mr Corbyn.
He will say: "Let's go with this Conservative government, get Brexit done, and unleash the potential of our great country - delivering on the public's priorities of our NHS, crime and the cost of living.
"Meanwhile the alternative is clear - Jeremy Corbyn and his two favourite advisers, dither and delay, turning 2020 into the year of two miserable referendums, one on the EU, and another on Scotland.
"And remember that a vote for any other minor party is effectively a vote for Corbyn, and his catastrophic political and economic programme."
Mr Corbyn will say on Wednesday that Labour will end the need for food banks if it takes power, stating that a Labour government will end "in-work poverty" and rough sleeping.
In a speech in Telford, Shropshire, on Wednesday he will insist the party will deliver "real change" and if voted into Government on December 12.
He yesterday accused the Tory leader of wanting to "hijack" Brexit, accusing him of wishing to "sell out the NHS".
The fresh spats come following a tumultuous day in politics on Tuesday, in which Jacob Rees-Mogg faced major criticism for comments on Grenfell.
While the Conservative Party was also accused of editing a video of Labour's Sir Keir Starmer so he looks like he was unable to answer a question on Brexit.
