Lord Michael Heseltine has slated Boris Johnson's "ruthless" government, claiming they will "stop at nothing" to push through their policies.
The ex-Conservative deputy Prime Minister's comments came as senior government adviser, Dominic Cummings, warned of public unrest if Brexit is not delivered.
He insisted that "serious threats" of violence received by MPs should be taken seriously.
But Lord Heseltine questioned the motive behind his warnings.
"What is a senior Conservative minister doing saying there will be riots on the streets?" he asked talkRADIO's Julia Hartley-Brewer.
"By saying these things will happen you can of course say that I never forecast they should happen - but you are encouraging people."
He called for Mr Johnson to "desist" in his role, following a fiery exchange with MPs in the Commons on Wednesday night.
The Prime Minister dismissed as "humbug" one Labour MP's claims that many politicians faced death threats from people using the same sort of language as him.
And he insisted the "best way" to honour the murdered remain-supporting MP Jo Cox was to deliver Brexit.
Lord Heseltine continued: "This is a ruthless government that will stop at nothing, as we have seen.
"They will search for any technique to secure their policies.
"They tried to prorogue Parliament and failed. They sacked serious numbers of people from the cabinet. They have alienated large numbers of members of the Tory Party."