Could Brexit scupper the G7?

<div>The long-anticipated G7 meeting in Cornwall has got off to a rocky start today, as it transpired that the US had lodged a 'demarché' - a diplomatic ultimatum - with David Frost, earlier in the week, over the UK's position on the Northern Ireland Protocol. Could tensions spill over? Cindy Yu talks to Katy Balls and James Forsyth.</div>