Check the election results for his two elections.
You still didn't answer the question and don't make it about this one issue.
He won 2 elections fair and square.
That being said, there is a huge difference between say Obamacare and Israel. Obamacare may or may not have been popular, but he convinced a slight majority of the House and a slight majority of the Senate to go with him, and therefore he AND Congress were the majority.
With regard to throwing Israel under the bus, the majority of the House and Senate totally disagrees with him, yet he is doing what he wants, and nobody can stop him. I call that anti-democratic and anti-american.
I understand that many would call Giuliani an extremist, and he has the famous video where he questions if Obama truly loves America?. You can agree with what Giuliani said or not, but when was the last time somebody even 'thought' of questioning if a President of the United States truly loves America?! The only President I can recall someone even questioning the love for his country, is Obama.
He has caused America to look weak to the world. He panders to terrorist states, and throws American allies under the bus.
So yes, someone who is pushing to hurt Israel and help terrorists, would be considered un-American in my eyes, specifically when he is doing it with no majority in either the House or Senate.
Maybe I am wrong, but I put much more credence in 535 members of congress, than in 1 single President. If he is trying to do something than an absolute majority of both Houses disagree with, he is acting un-American in my book.