I thought long and hard. Imagine that during the Iraq war an American had said that Hussein was admirable, that he his sons were "great leaders." How about: "“If (Putin) says great things about me, I'm going to say great things about him,” Trump said.
Giving aid & comfort to a country's enemies is treason. Failing to admit what has been declared true by all of one's country's security agencies, that Putin was behind the email hacking, would fit that definition. The only out for Trump would be to argue that Russia and Syria are not enemies. How he could then ask to be commander-in-chief of men and women that currently are risking their lives to fight these tyrants is unconscionable.
But that isn't all: he is undermining the security of our nation, calling upon us to view the election as rigged, as a vast conspiracy between the media, mysterious foreign powers, and the election process, itself. 
Trump isn't just an orange haired buffoon--- people laughed at Hitler, too. He is dangerous.