Keir Starmer has suggested the US is trying to interfere in British democracy after JD Vance, the US vice-president, blamed the murder of the British teenager Henry Nowak on mass migration.

The prime minister’s office responded after the senior Republican politician claimed in a post on X that Nowak would be alive “if the last few generations of European elites had stood their ground against the politics of self-hatred and the mass invasion of migrants, many of whom despise the West and the people who love it”.

Downing Street did not name Vance directly but said its response to his comments was that “in recent days we have seen people trying to interfere in our democracy and seeking to stir up division on our streets”.