The former British ambassador to the US has issued a warning to the source of a leak of private emails criticising the Trump administration.
Sir Christopher Meyer said whoever shared memos from the UK's ambassador to Washington Sir Kim Darroch addressed to the government should "think carefully" before divulging anything else.
"What I would say to the person or persons who dumped this cache of papers on the Mail on Sunday is that you have done not only serious damage to the career of a diplomat of high integrity, you have actually dented the national interest as well," he told talkRADIO's Julia Hartley-Brewer.
"If you are planning to dump more stuff, just think carefully before you do so."
The leaked emails include Sir Kim's scathing assessments of the White House from 2017 to present day, including one calling it "uniquely dysfunctional" and "divided".
Since they emerged, the US president said he would "no longer deal" with the British diplomat.
Speculating on who could be behind the leak, Sir Christopher said: "Someone who is determined to wreck the rest of his time in DC, such that he would need a replacement.
"When you start with the question 'Who benefits?', it can lead to several destinations. I wouldn't like to speculate."
He added that the act of leaking the private memos was "disgraceful and deplorable".
"He [Sir Kim] is not ploughing a political path. What he is doing is judging the situation as he sees it since 2017, making an analysis and sending it back to London."