WASHINGTON - George Will, a prominent American columnist,  has left the Republican Party, and he is urging others to make sure the party's presumptive nominee, Donald Trump, doesn’t win.

“Make sure he loses,’’ Will told PJ Media, an online news service, in an interview Saturday. “Grit their teeth for four years and win the White House.”

Will, a Pulitzer-Prize winning columnist, spoke at the Federalist Society luncheon. “This is not my party,’’ he said during the speech. According to PJ Media, Will said he has changed his Republican registration in Maryland to “unaffiliated.’’

Will, a Pulitzer-Prize winning columnist, has long been critical of Trump. The Washington Post columnist warned in a column in April that Trump’s damage to the party had only just begun.

Trump, he said, would be the “most unpopular nominee ever’’ and unable to get support from women, minorities and young voters.

In a column earlier this week, Will urged Republican donors not to contribute to Trump's campaign. Trump, in turn, called Will a “major loser’’ last month on MSNBC’s programme Morning Joe.