Hitler scapegoated Jews, segregating and eventually killing them. Trump is not blaming any racial group but rightfully pointing out that when you have 10% real unemployment and lower workforce participation, it is helpful to stop immigration and deport those who violated immigration law.
Hitler was a nationalist and socialist. Trump is a nationalist but not a socialist. Sanders is a socialist, openly so. Nationalism isn't dangerous - no one cares if someone is a Swedish nationalist. It is socialism that is so deadly - read about Venezuela's economic melt down, for example, and Zimbabwe.
And Trump isn't going to invade any countries, simply say no to Muslim immigrants when we can't vet which ones are terrorists like the San Bernadino shooters. Hitler was a nationalist and invaded other countries to take over areas ethnically German but part of other countries, before taking over other whole countries.
Hitler was big on projecting German power in the world, build up the military. Trump wants to bring home our troops from nations around the world or bill them for our people defending their countries, like South Korea and Japan.