I despise Trump, but I do not buy that argument for a second. You’re clearly taking a meaning that you’re inventing on your own, not from the text itself. “Let Israel go and finish it” could just as easily be interpreted as “they need to wrap this war up and reach a cease fire.”
Kamala called for a ceasefire, but her and Biden wouldn’t lift a pinky finger to actually produce such a cease fire. Trump seems to have actually succeeded at getting a ceasefire.
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He’s had people involved in backroom negotiations for months. Yes, it is a dirty tactic. This has a lot of undertones of Reagan’s deal with the Iranians. He didn’t have great intentions in negotiating a ceasefire, but he did manage to do it. And Trump has shown a willingness in the past to hold US military aid as a stick to change the behavior of allies. It’s reasonable to think he did the same thing here.
The US DOES have substantial control over Israel. Reagan for instance dramatically affected Israel’s behavior by withholding weapons. Biden was more permissive of Israel than Reagan was.