Obama was not an authoritarian. Bush 2 was maybe a little bit (remember after 9/11 and the spokesman said don't question the president). But trump is far far past all recent presidents in being an authoritarian. He lives for that, and sucks up to leaders like that in other countries. He says he doesn't want to get us in a war, but he seems willing to do anything to divert public attention (like his recent completely racist tv commercial he was pushing before the election).