First off, in his defense NO Trump did not ask his supporters to take a pledge of allegiance to him. However, he did have these people raise their right hands and swear to vote for him in the FL primary. Regardless how one interprets this I find it disturbing for anyone, be it Trump, Cruz, Rubio… obama, to ask people to swear to do anything.
This is America we swear an allegiance to God and Country not man and government.