Here is Michael Scheuer's analysis why this is so:
Mr. Trump, stop being played as a dumb ass by Jewish-Americans. Every American soldier, Marine, and U.S. civilian who has died or been wounded or maimed since Osama bin Laden declared war on the United States in 1996 has been the victim — in significant part — of the record of slavish and largely unquestioning U.S. support for Israel’s national security interests.
This kind of policy requires the utter abandonment of all the tenets inherent in the concept of America First. Together, your selection for ambassador to Israel — a supporter of West Bank settlements; that is, the brazen theft of Palestinian land — and your promise to move the U.S. embassy from Tel Aviv to Jerusalem will do four disastrous things: they will kill and maim more U.S. military personnel; decrease U.S. national security; prolong America’s Islam war by decades; and irreparably rupture the trust of your political base’s faith in your promise of putting America first.
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I agree with Mr. Scheuer - America First and Support for Israel Are Polar Opposites !!!
However, let me make something crystal clear - to the extent that Israelis are righteous and beloved of G-d, I support them. And to the extent that my fellow Americans are righteous and beloved of G-d, I support them, too.
But my true love and devotion is to G-d Himself, as it should be for all of us. For as Jesus said:
And thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind, and with all thy strength: this is the first commandment.
Mark 12:30 KJV
And love thy neighbor as thyself. How many of us are doing that? Not too many since Obama ad-Dajjal and Hillary tore us apart.
Our policy ought to be "G-d First" and then America. That does NOT necessarily mean "Israel First".