George Will, a longtime political commentator and staunch defender of the conservative movement, made a dramatic exit from the Republican Party Friday, citing the party’s support for Donald Trump in the upcoming 2020 presidential election.

In a speech at a luncheon held by the Federalist Society, Will urged other conservatives not to support Trump as the GOP nominee. “This is not my party,” Will said the speech, noting that while it’s a little too late to find a replacement for him on the ticket, conservatives can “grit their teeth for four years” after making sure that Trump loses.

Will mentioned that he had switched his voter registration from Republican to “unaffiliated” in the state of Maryland. He told the Washington Post, where he writes a column, that he made the change several weeks ago, after House Speaker Paul Ryan endorsed Trump for the 2020 election.

The move follows the departure of other notable conservatives from the Republican Party, such as Mary Matalin, a longtime strategist for the party. Matalin switched her party affiliation to Libertarian, though she noted that it wasn’t related to Donald Trump. For his part, Will did not say who he would support in 2020.

Also on Friday, Will publish a column in the Washington Post that further explained his view, using the kind of excoriating language his columns are known for. The column, titled “Vote against the GOP this November,” argued that the number of Republicans in Congress “must be substantially reduced.”

Quoting from a variety of works, such as Robert Bolt’s play A Man for All Seasons and The Federalist Papers, Will also found caustic words of his own for Republican leaders, notably Ryan. The House Speaker, Will wrote, “sold his soul… for a tax cut” and had become one of “the president’s poodles.”

Although Will has been a vocal critic of President Trump in the past, his statements and actions on Friday surprised many political observers on social media.

Did you ever think you'd live to see the day that George Will called for Democrats to take over both houses of Congress? Me neither. https://t.co/YJUOWKobBx — Ruth Marcus (@RuthMarcus) June 22, 2018

There really isn’t a way to express how seismic it is for ⁦@GeorgeWill⁩ of all people to tell Republicans to vote for Democrats in November. https://t.co/WoB1x1pW1T — shauna (@goldengateblond) June 22, 2018

Will was a contributor to Fox News between 2013 at 2017. In May 2017, he became a political contributor for NBC news and MSNBC. Previously, he served as editor of National Review and wrote a back-page column for Newsweek between 1976 and 2011.