The Chancellor has said that he will slash public spending and increase taxes in an emergency budget that he would introduce if Britain votes to leave in the referendum, in a move that some have described as him 'punishing' Leave voters.
But the 57 Conservative MPs, which includes Iain Duncan Smith and Bob Blackman, have branded the proposed budget as "absurd" and have said his position would be "untenable" if he tries to cut school, police and NHS spending.
As part of a series of government warnings about leaving the EU, Mr Osborne and his Labour predecessor, Lord Darling, set out £30billion of tax rises and spending cuts.
Speaking of the proposed budget, Mr Blackman, who supports the Leave campaign, said: "I strongly hope that the people of Britain decide to vote to leave the European Union next week.
"I am concerned that the campaign for Britain to remain in the EU has constantly opted to promote a climate of fear and uncertainty as to the future of the UK outside the EU.
"I will strongly oppose any threat to punish the people of the UK for voting to leave the EU.
"The government will accept the will of the British people next week and the money we currently send the EU every week can be used to fund public services and to reduce taxes, to create the environment in which business can invest and create new jobs."
The UK goes to the polls to vote whether to remain in the EU on June 23.
Meanwhile, Uxbridge MP Boris Johnson went head to head with SNP's Alex Salmond in a YouTube EU debate.