There may ultimately be nothing to the Russia story, and Trump’s case for his new travel ban and other actions may be strong. But what he fails to understand is that by embracing conspiracy theories such as the one about Obama, he is fueling a belief that he is out of control. If that belief continues to build, it will further strengthen and embolden the Democrat “resistance,” and it will undermine his ties with congressional Republicans and the anti-anti-Trump conservatives who are ready to oppose progressive attempts to delegitimize his government. Trump’s main problem is not so much his foes in the media or the Democrats but his own character. The struggle that will determine whether he is a successful president is his struggle with himself.