I wouldn't agree that George H. W. Bush as VP had any influence on the Reagan Administration's policy toward Israel. Nor would I call George H. W. Bush anti-Israel or antisemitc.
As for George H. W. Bush endorsing the Witch in the current presidential election, this is merely MSM rumor and innuendo at this point, although it's a possibility. Even if, for the sake of argument, it's true, it won't have any significant effect on the current presidential race. George H. W. Bush is past 90 years old at this point and his state of mind is questionable. The most apparent explanation for any George H. W. Bush endorsement of HRC is the shabby way in which Trump treated Jeb during the Republican primary process..
There does seem to be something fishy in the unusual closeness between the Bush and Clinton clans which has been going on since W left the White House. Does anyone have an explanation for this?
Yeah.... I would disagree with you. One ex advisor to the Reagan administration claimed that George H. W. Bush hijacked the foreign policy -- especially the Middle East. It could have been worse. Whenever Israel made a defensive move, James Baker called for Reagan to really slam Israel, but then Pres. Reagan overruled him. Pres. Reagan recognized the PLO at the insistence of Bush (41).