Rabbi Marvin Hier has known Charles and Seryl Kushner — Jared Kushner’s parents and Donald Trump’s in-laws — for decades. The Hiers and the Kushners have gone to the same kosher for Passover resort, the Arizona Biltmore, over the years. The Kushner family, prominent real estate developers, have also been generous donors to the Simon Wiesenthal Center founded by Hier, for which he now serves as dean. But the Los Angeles-based Hier said he was shocked three weeks ago when a Trump aide invited him to offer a prayer at the presidential inauguration. The 77-year-old rabbi said he accepted immediately...