Former president Donald Trump began attacking Democratic presidential hopeful Kamala Harris’ pick for VP hours after the announcement, casting Minnesota Gov. Tim Walz as “a dangerously liberal extremist,” after the former congressman called him “weird.”

The announcement came Tuesday morning ahead of an important campaign rally in Philadelphia, Pennsylvania, during which the current US Vice President will formally introduce Walz as her running mate. Pennsylvania is a crucial swing-state that could make or break the Democratic presidential nominee’s prospects of claiming the White House.

The Trump campaign issued a nasty statement to Harris’ pick: “It’s no surprise that San Francisco Liberal Kamala Harris wants West Coast wannabe Tim Walz as her running-mate – Walz has spent his governorship trying to reshape Minnesota in the image of the Golden State,” the statement reads. “While Walz pretends to support Americans in the Heartland, when the cameras are off, he believes that rural America is ‘mostly cows and rocks.'”

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The statement continued, “From proposing his own carbon-free agenda, to suggesting stricter emission standards for gas-powered cars, and embracing policies to allow convicted felons to vote, Walz is obsessed with spreading California’s dangerously liberal agenda far and wide. If Walz won’t tell voters the truth, we will: just like Kamala Harris, Tim Walz is a dangerously liberal extremist, and the Harris-Walz California dream is every American’s nightmare.”

Trump and his running mate J.D Vance of Ohio appear to still be irritated by Walz’s earlier assertion that Vance is “weird,” something that obviously got under his skin as he angrily called Democrats “the weird ones.”

The playground-style insult may have lifted Walz’s chances of becoming the Vice Presidential nominee as the comment garnered national attention. Now Democrats are following suit and the Trump campaign couldn’t be madder.

Democrats have not-so-subtlely weaved “weird” into online posts and interviews. In most instances, the word follows comments regarding Vance’s comments on abortion and his assertion the US is being run by “a bunch of childless cat ladies,” which was rooted in his belief that childless political leaders “don’t really have a direct stake” in the country.

No one really expected the two-time Minnesota governor to win the Veepstakes, although now many prominent Democrats are praising his political track record. They commended several policies he signed into law while in office, including free school meals for children, paid family and medical leave, and an expansion of the child tax credit.