Labour will accuse David Cameron of misleading the public over his plans to privatise the NHS in England and call for contracts putting the service "up for sale" to be frozen until after the general election.
Andy Burnham will claim the Prime Minister was "not up front" about his intentions for reform during the 2010 campaign, leaving voters with no say.
In a speech in Manchester, the shadow health secretary will insist that forced privatisation is being pushed through "at pace and scale" and warn that contracts being signed now will bind the next government.
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Theresa May said the number of high rises which have failed fire safety tests has risen to 120.
The pair faced each other in the first Prime Minister's Questions since the General Election.