Doyle McManus: Trump will have a 2020 primary challenger, but who will it be?
It's way too early to think about the 2020 presidential primaries - too early for normal people, that is. But that hasn't stopped politicians in both parties from doing just that. And yes, that includes Republicans, many of whom are already pondering who might challenge President Donald Trump for the GOP nomination three years from now.
"I don't see how we can avoid it," Vin Weber, a former Republican congressman, told me recently. "It's pretty clear someone's going to do it."
"I think he's inviting one," Sen. Jeff
