Yvette Cooper has denied that the Prime Minister launched an attack on the Greens and Reform at a Munich conference because he is "rattled".
The Foreign Secretary was grilled on what domestic UK politics had to do with the security audience for that speech in Germany.
Ms Cooper said on Sunday that the "wider issue" is that "having partnerships abroad... will make us stronger at home".
She added: "The NATO alliance is really important to that, and we have seen both Reform and the Greens undermine that commitment to the NATO alliance.
I think that is hugely important because I think our national security comes first, and taking seriously the threat from Russia which they are not doing."
She accused Reform UK of having "failed to do an investigation into Russian interference within their own party, despite the fact that their Welsh leader was convicted of the links".
She claimed Reform UK has "dismissed the aggression and the threat from Russia".
When asked by Sky News' Trevor Phillips if it is actually a sign that the Prime Minister is "rattled" by domestic politics, and could signal that he is on his way out, Ms Cooper said: "I don't think that's the case at all."
Speaking from the conference, she added: “The partnerships that Keir Starmer has built with other leaders, the work that we are doing together, is immensely important.
Keir Starmer is rattled knowing he isn't going to be the prime minister for much longer.