Over Memorial Day weekend, presumptive Republican presidential candidate Donald Trump took a shot at William Weld, calling the former Massachusetts governor and current Libertarian vice presidential nominee an alcoholic. Weld had previously attacked Trump over his immigration policy, brashly comparing it to Kristallnacht of the Holocaust.

“I don’t talk about his alcoholism, so why would he talk about my foolishly perceived fascism?” he told the New York Times through a spokeswoman.

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Trump’s counterpunch holds merit. Weld was famous for enjoying “amber-colored liquid” during his time in office as governor. He has appeared publicly inebriated several times, including at a Rolling Stones concert in 1997 where witnesses said he was so intoxicated that he had trouble walking.

Trump has never had an alcoholic drink in his life, since during his childhood his brother Freddy died from alcoholism. This has motivated Trump to stay sober throughout his successful life.