Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE is weighing in on George Will’s decision to leave the Republican Party because of the presumptive GOP presidential nominee, saying the conservative pundit “lost his way long ago.”

Trump took to Twitter early Sunday, after returning to New York from a trip to Scotland to open a golf course.

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

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“This is not my party,” Will, a frequent Trump critic, said during a Friday speech to the Federalist Society, according to the conservative-leaning outlet PJ Media.

Will said he has switched his Maryland voter registration to "unaffiliated."

“Make sure he loses," Will said during a later interview, adding that Republicans should "grit their teeth for four years" during a Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE presidency and win the White House in 2020.