This is not how US Politic works. Unlike Australia or the UK, congress and senate both separate from the office of President. The Pres can't do anything if he does not have control of either/both Senate and Congress. So Trump is going to need to stick to the party than the other way around, the party control both houses, not the president. In Australia or UK, the leader of the country is by default, the leader of the Parliament (Otherwise you can't form a government), it's not going to be the case in the US. Even now, it's a Dem president but a GOP congress with a Dem senateTrump is very independent of the Republican Party. That's because they need him (to fill lower level seats) but he doesn't need them (except to pass the two party gauntlet that is impossible to remove in the short term).
As for this talk of 'let them finish' he has to say certain things to please the Zionist king makers, else he can kiss goodbye to the election, his wealth and his future. It is also true that Jared has enormous influence on him through Ivanka (or Ivana, I can never remember which is which), but he also prides himself on being his own man and not taking orders from anybody. His ego will demand that America is seen as bossman in any dealings with Israel.
On the other hand, you have to be extremely naive to think Trump is going to be a boss of Israel. Again, Israel pulls in the US political scene is enormous, when Trump said let them finish, it means he is going to give no bar support to Israel to finish the job. I mean you are the only person I know both from this forum and other would think Trump is not going to support Netanyahu.....