I should say before I start this post that I am reporting what other people are saying and do not endorse any of the arguments below whatsoever.
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"Interesting many posters choose to focus on the Jews rather than the ludicrous accusation supporters of The Donald 'did it'."
Ich did dismiss it out of hand, to be fair, but I suspect that there are two reasons it wasn't commented on: firstly, the current crisis in the Labour party is primarily about the anti-Semitic aspect, and secondly, what even could Willsman possibly have meant by it? I was scratching my head about that all day.
Anyway, now I have the answer: Trump has been implicated, either directly or indirectly, in the sort of Zionist conspiracy theories that really whip up these sort of nutters. For example, there's this article, describing Trump as Israel's "useful idiot":
// The Israelis have found the new administration in Washington to be what Lenin once described as a “useful idiot,” prepared to support whatever Netanyahu proposes while at the same time so clueless that the Israeli government can freely and openly simultaneously cut deals with Moscow... //
https://ahtribune.com/us/israelgate/2369-useful-idiot-trump.html
or this smaller one, also arguing that Trump's agreements with Putin serve to help Israel:
https://russia-insider.com/en/politics/trump-meeting-putin-do-netanyahus-bidding/ri24021
I suspect I've barely scratched the surface, but yeah -- I think it's pretty obvious that Trump is pro-Israeli, in line with typical US policy for the majority of the last 60+ years; but these conspiracy theorists go much, much further.
No wonder Trump got dragged into this. He should not have been. It's ridiculous.