The U.S. warned the U.K. against using “prescribed one-size-fits-all government restrictions” and “blunt regulatory instruments” in a submission to the U.K. government’s consultation on the plans.

“There has always been a recognition that leaders have to take steps to protect children. I don’t think that’s controversial,” the British prime minister said.

In an accompanying statement, the Department for Science, Innovation and Technology said AI “romantic companion” chatbots that simulate sexual or romantic relationships will also be banned for use by under-18s.

The U.K. government will look “in more detail” at overnight curfews and breaks in infinite scrolling for under-18s, and will set out its plans in July, DSIT added.

The U.K.’s communications regulator Ofcom, which enforces online safety laws, said it is “ready to work closely” with the government as the “detailed regulations take shape.”

Proposals for the ban will be brought to U.K. lawmakers before Christmas, Starmer said, with the new protections expected to come into force in spring  2027.

This developing story is being updated.