Oh, grow a pair and announce your primary challenge already!
This seems like a weird reaction, given that it's only 2018. This isn't a parliamentary system, so Kasich can't force Trump out now, two years before the election. Trump's term ends in more than two years whether Kasich announces now or six months from now.
It's just annoying to hear him go on and on about this but then just sit back and do nothing.
"Trump is not the GOP."
"So does that mean you're going to run for President, become a large figure who opposes Trump, and push voters in your direction?"
"I have no plans yet."
Does the same logic apply to the Dems who're presumed to be prepping for 2020? E.g., "Why doesn't Martin O'Malley just announce his candidacy already?" Or does it only matter for the potential Republican candidates?
O'Malley and other Democrats aren't talking about primarying an incumbent.
I just don't understand why primarying an incumbent means that you have to announce two years in advance while running in an open race doesn't. Where did this rule come from?
It's very unwritten and based on the need for a candidate primarying an incumbent President to get attention.