This reminds me of the TV show Big Brother. Israel has manipulated the U.S. to do its dirty work, so that Israel has no "blood on its hands".

Right now, Iran has been keeping its promises. It is Trump who is getting the U.S. to break ITS promise. If Congress actually re-imposes sanctions, Trump is correct in that Rex Tillerson shouldn't bother talking to North Korea, since nobody will believe the U.S. will keep its side of any bargain.