Shadow health minister Diane Abbott has tweeted:
What price xenophobia? Stigmatising foreigners accessing NHS creates a public health risk.
@paulwaugh Agree with charging people who are not entitled to free NHS care. But obvious public health risks re. communicable disease.
Earlier, Labour's shadow health minister Liz Kendall said the government had a "poor record in announcing policies that sound good but prove to be completely unworkable" and they would be asking "many questions" on the proposals.
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The Foreign Secretary was unable to rule out the possibility of continuing to pay money into the EU when he spoke to Peston On Sunday.
He told Peston on Sunday: "The country is crying out for leadership from the Prime Minister. We want to know her vision."
All the profits from the sale of each download of the forthcoming single would go to Shooting Star Chase and Together for Short Lives.