Rich Lowry: Don’t root for a primary challenge to Trump

The race for 2020 is taking shape, although there are still significant unknowns, including whether Donald Trump will get a serious primary challenge.His fiercest Republican critics say, "Yes — please, please, yes."They are probably wrong, and it's certainly nothing to root for.Trump's dominance of the party begins with his lockdown support of the right, forcing any primary challenger to the left. This isn't fertile territory. Self-identified moderates and liberals are only a fraction of t