Former U.S. State Dept. Middle East Negotiator Aaron David Miller discusses the U.S. response to settler violence in the West Bank. WSJ Chief Foreign Affairs Correspondent Yaroslav Trofimov on the latest from Ukraine and the uncertain future of Ukraine’s army chief. Tina Nguyen reports from inside Trump's GOP in her new book "The MAGA Diaries." From the archive: Roger Federer joins the show.