Last week, Congress released more than 2,300 emails Jeffrey Epstein sent and received between 2008 and 2019. The most substantial revelation, as highlighted by Democrats in the first leak, was that the late sex offender once said of Donald Trump, “Of course he knew about the girls.”

But a 2018 email Mark Epstein sent to his brother, Jeffrey, may ultimately have the most impact. The one-sentence question about someone named “Bubba” has gone viral, spawning a new conspiracy theory and forcing us to ponder appalling questions we never thought we would.

Specifically, did Donald Trump have sexual relations with that former president, Bill Clinton?

The evidence for this theory, such as it is, is this one March 2018 email exchange. Mark checks in with Jeffrey, asking, “How are you doing?” Jeffrey says he’s with Steve Bannon, Trump’s former White House chief of staff. Then Mark says, “Ask him if Putin has the photos of Trump blowing Bubba?”

To many, this was obviously a joke. In March 2018, questions about whether the Russians had footage of Trump engaging in taboo sex acts were very much part of the national conversation. Days before the........

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