Democratic national committee chair Ken Martin calls on defense secretary to resign; House speaker Mike Johnson signals support for Pete Hegseth and national security adviser Mike Waltz

• Signal leak reveals depths of Trump administration’s loathing of Europe

The UK still has “high confidence” that its operational security measures “remain intact”, despite revelations of a major US security breach.

Asked about the incident on Tuesday, armed forces minister Luke Pollard told the Commons Defence Committee that no British service personnel had been put at risk as a result.

Pete Hegseth was unfit to lead the Defense Department even before he risked our national security through his own sloppy handling of sensitive military information. Just like his boss Donald Trump, Hegseth – and everyone else involved – put on a stunning display of recklessness and disregard for our national security.

Hegseth should resign, and if he doesn’t resign, he should be fired. It’s crystal clear that our men and women in uniform deserve better – and that our national security cannot be left in Hegseth’s incompetent and unqualified hands.