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Boris Johnson has said he is “glad” the father of a sick child challenged him about NHS funding in a hospital corridor.
The prime minister was confronted by Omar Salem at Whipps Cross University Hospital in north-east London.
Mr Salem, who said his seven-day-old daughter had been “gravely ill”, told Mr Johnson there were not enough staff.
The PM later wrote on Twitter that the encounter was not “an embarrassment” but “part of my job”.
He added that it did not matter whether people “agree with me”.
In a conversation lasting around two minutes, Mr Salem – who was later revealed on social media to be a Labour activist – said the situation he had experienced at Whipps Cross was