WEST PALM BEACH — Susie Wiles, the people who know her the best believe, is a force more sensed than seen. Her influence on political events, to many who know what they’re watching, is as obvious as it is invisible. The prints leave not so much as a smudge. It’s a shock when she shows up in pictures. Even then it is almost always in the background. She speaks on the record hardly ever, and she speaks about herself even less. … Wiles is not just one of Trump’s senior advisers. She’s his most important adviser. She’s his de facto...