I see no reason to believe that Harris disagrees with Biden on the fundamentals of his Middle East policy. Even if she did, it would be suicide to abandon Israel altogether. As a result, it won’t happen.
But I expect to see differences in nuance, partly in an effort to unite the party, and partly out of conviction. I think Harris will tell the world that she is completely dedicated to the defense of Israel, but that she has no intention of handing Bibi a blank check. America will protect Israel from attacks by Hezbollah and Iran, but offer no guarantees of support for offensive operations, particularly those that unnecessarily endanger civilians.
That is as it should be. It is not in the interest of America to play Imperial Germany to Israel’s Austria-Hungary.