Backers of the prime minister noted the father, who was revealed as Mr Omar Salem, was an activist for the main opposition Labour Party.
Mr Salem said: "What do you mean there's no press here, who are these people?"
David Lammy tweeted: 'He just can't stop lying.' And the Tottenham MP's colleague Diana Johnson, who sits on the Commons health committee, added: 'This is blatant lying from the prime minister'. "Years and years and years of the NHS being destroyed".
British Prime Minister Boris Johnson has been confronted by an angry parent during a hospital visit.
The man, whose furious tirade was captured by TV cameras accompanying Mr Johnson on his tour, told the Prime Minister his daughter "nearly died yesterday".
The man, identified as Omar Salem, told the Prime Minister that the health service had been "destroyed".
Labour said Mr Johnson was being confronted by the effects of Conservative austerity and hit out at his claim there was "no press" at the event.
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"I've been PM for 57 days, part of my job is to talk to people on the ground and listen to what they tell me about the big problems".
"I'm glad this gentleman told me his problems", he stated.
"I think members of the public are becoming increasingly frustrated with photos and campaign visits when they want to see him sat down dealing with Brexit and other important issues". "This isn't an embarrassment this is part of my job".
Mr Johnson was visiting Whipps Cross University Hospital in north-east London when he was challenged by the parent on a children's ward.
On Twitter, Salem said that his daughter recieved good care in the emergency care but she had waited to see a doctor for hours when transferred to the children's ward.
The dad, who is a Labour activist, later tweeted that he chose to approach Mr Johnson in a corridor at the hospital because his "gravely ill" daughter had been "neglected for hours" there.
"My Labour values are WHY I back proper support for the NHS".
On a visit to Yorkshire two weeks ago, the PM was told by a member of the public he should be in Brussels negotiating with the European Union instead of touring Morley high street, near Leeds.