WASHINGTON — He was straight out of Foggy Bottom central casting.

Lean and bespectacled, with neatly combed gray hair and a pressed charcoal suit, William Taylor, the acting U.S. ambassador to Ukraine, gave not so much as a glance toward the massed cameras as he arrived Tuesday, escorted by uniformed police, at the offices of the House Intelligence Committee. With steady gait and grim countenance, he disappeared behind a basement door marked “Restricted Area.”

But once inside, he delivered words that could end a presidency.

“In August and September of this year, I became increasingly concerned that our relationship with Ukraine was being fundamentally undermined by an irregular informal channel of U.S. policy-making and by the withholding of vital security assistance for domestic political reasons,” Taylor testified, according to a copy of his remarks obtained by The Washington Post. Taylor said President Trump himself made the release of military aid to Ukraine contingent on a public declaration by Ukraine’s president that the country would investigate Joe and Hunter Biden and the 2016 election.

In an instant, the impeachment inquiry no longer rested on the credibility or motives of a whistleblower, nor arguments about the meaning of quid pro quo. Here, spelling out Trump’s wrongdoing in extensive detail, was the diplomat Trump’s team brought out of retirement to be the ambassador to Ukraine. Taylor, an Army veteran and a respected diplomat who obviously kept detailed notes, will not be easy to discredit.

Trump, more than anybody, must have known how damaging Taylor’s testimony would be. Ninety minutes before Taylor was slated to arrive, Trump created a diversion. He tweeted to his 66 million followers: “All Republicans must remember what they are witnessing here — a lynching.”

It was a grotesque provocation, clearly aimed at fomenting racial division — and it worked, for a bit. Reporters momentarily stopped asking about Taylor and started asking about lynching. Democrats reacted with outrage. And Trump’s boosters in the House defended him.

But ultimately no amount of distraction could counter what was happening in HVC-304, three floors beneath ground level in a secure room in the Capitol Visitor Center. As the day wore on, and reports of the deposition leaked out, there was a palpable change above ground.

When Senate Republican leaders gave their weekly news conference after lunch, Fox News’ Chad Pergram observed that Republicans “criticize the process and don’t defend the president outright.” Pergram asked Senate Majority Leader Mitch McConnell directly: “Are you willing to defend the president in this matter?”

“I’m willing to talk about the process,” McConnell replied.

McConnell also said Trump’s “lynching” claim “was an unfortunate choice of words.” Asked about Trump’s claim that McConnell told Trump the call with the Ukrainian president was “innocent,” McConnell contradicted Trump: “We’ve not had any conversations on that subject.”

Combined, the Republican leaders complained about the “process” 31 times — but uttered the names “Taylor” and “Ukraine” not once.

Now, Republicans object to the impeachment depositions being taken behind closed doors, even though Republicans did much the same in the past. But will they really be happier when proceedings become public? How can they defend a man publicly implicated by his own subordinates?

You might call it a work in “process.”

Dana Milbank is a syndicated columnist. You can follow him on Twitter, @Milbank.

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