It meant a child like Charlie could not see, hear, cry or swallow, and needed help to breathe.
President Trump also weighed in on Twitter, telling Charlie's parents that the U.S.is ready to help any way we can.
Early last week, the European Court of Human Rights determined that Charlie should be taken off life support against his parents' wishes and allowed to "die with dignity".
President Donald Trump and Pope Francis brought worldwide attention to the family's legal battle this week by commenting on a case that pits the rights of parents to decide what's best for their children against the responsibility of authorities to make sure children receive the most appropriate care. He suffers from mitochondrial depletion syndrome, a rare genetic illness which leads to progressive brain and muscle damage.
Charlie's life has hung in the balance since his birth.
According to the Daily Mail, there is no confirmation from British officials as to the nature of the meeting, but said that officials are "preparing a detailed briefing for [May] on Charlie's case in anticipation of likely questions from Trump".
On Tuesday, the parents lost a bid to take Charlie to the US for trial therapy when the European Court of Human Rights sided with earlier rulings that continued treatment would cause "significant harm" and that life support should end.
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Charlie's parents had expected his life support machine to be turned off on Friday, but Great Ormond Street said it was continuing treatment to allow the family to spend more time with the baby.
Donald Trump "himself has not spoken to the family, he does not want to put pressure on them", said Ferré.
"He prays for them in the hope that their desire to accompany and care for their child will not be disregarded", the Vatican said in a statement in Italian, using the term "curare", meaning "s Occupy "and" treat ".
"They are traditional men who believe in the family", she said of Francis and Trump.
Charlie's mum Connie said: "The support from the Pope and the President has given us hope". In the post, the president claimed the United States would be "delighted" to help Charlie in any way possible.
"They believe in our case and understand why we believe it is right to continue fighting so hard to save Charlie".