CHRIS WALLACE, "FOX NEWS SUNDAY" MODERATOR: George, I want to talk about you. You announced this week that you have left the Republican party. Why?
GEORGE WILL: I left it for the same reason I joined it in 1964 when I voted for Barry Goldwater. Because I was a conservative. I leave for the same reason, I'm a conservative. To give you a time line, shortly after Trump became the presumptive nominee, he had a summit meeting with Paul Ryan where they stressed their common principles and their vast shared ground, which is much more important than their differences.
I thought that was puzzling doubly so because Paul Ryan still didn't endorse him. After Trump went after the Mexican judge from northern Indiana, then Paul Ryan endorsed him. I decided that, in fact, this is not my party anymore. I changed my registration to unaffiliated 23 days ago. I hardly made an announcement. I just mentioned this in a meeting with the Federalist Society. The long and the short of it is, as Ronald Reagan said when he changed his registration, I did not leave the Democratic party, the Democratic party left me.
WALLACE: Now, not surprisingly, Donald Trump has tweeted his reaction to this news. Let's put it up on the screen. He says you are "overrated" and that you lost your way a long time ago. Would you like to respond?
WILL: He has an advantage on me because he can say everything he knows about any subject in 140 characters and I can't.
George Will, one of the most overrated political pundits (who lost his way long ago), has left the Republican Party.He's made many bad calls
— Donald J. Trump (@realDonaldTrump) June 26, 2016