How to explain such behavior? That has become the question for nearly everyone perplexed by President Donald Trump’s bizarre performance at Monday’s joint press conference with Russian President Vladimir Putin.

And when put to Sen. Jeff Merkley (D-Or.) directly this week—Do you think Putin has something on Trump?—the senator responded calmly and simply: “I think it’s likely. Yeah.”

With a follow-up question in the interview, Buzzfeed‘s Ben Smith wanted to know if it could actually be the “pee tape”—a reference to an unconfirmed and selacious detail included in the so-called “Steel Dossier.” To that specific question, Merkley once again responded calmly: “Something close to that. Something close to that.”

Watch:

As Aaron Blake, writing for the Washington Post on Tuesday, notes:

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