She ferociously held her ground in an Oval Office showdown, daring him to make good on his boast that he had the votes in the House for his wall. Pelosi declared that “there are no votes in the House, a majority of votes, for a wall — no matter where you start.” Trump insisted that he’d have the votes if he wanted them. " Well, then go do it. Go do it," she said confidently. Wham!

When Trump insisted that the Democrats' package was not “good border security,” she replied: “It’s actually what the border security asked for.”

When Trump kept insisting that only a wall would provide security or that the Army would go ahead and build the wall anyway, she put her foot down. “What the president is representing in terms of his cards over there are not factual. We have to have to an evidence-based conversation about what does work, what money has been spent, and how effective it is,” she said. “This isn’t about — this is about the security of our country. We take an oath to protect and defend, and we don’t want to have that mischaracterized by anyone.” Ouch.

Senate Minority Leader Charles E. Schumer (D-N.Y.) did his part as well, prodding Trump into accepting responsibility for the wall and ridiculing his triumphalism over winning deep-red Senate seats.

Nevertheless, it was Pelosi who did what the media has not done — interject, fact-check to his face and refuse to allow him to operate in a parallel reality. It’s not just that Trump has blurred the difference between facts and lies, but that so few have stood up to him in the moment for all the public to see. Perhaps Pelosi will start a trend.

She managed to get under Trump’s skin. Eli Stokols of the Los Angeles Times later reported, "It sort of spiraled out of control, and when the President left the Oval Office after Pelosi and Schumer left, a number of people saw him, he stormed out of the Oval, walked into an anteroom just off the Oval Office, and had in his hand a folder of briefing papers, and he just scattered them out of frustration, threw them across the room and expressed frustration to the people who were present.”

Pelosi came out triumphant. As my Post colleague Colby Itkowitz wrote, “Pelosi emerged from the meeting not some wilted flower, but a symbol of a woman who doesn’t have time for male posturing. ... Pelosi kept her composure throughout the charade, continually trying to bring the conversation back to a place where actual dialogue could occur.”

Pelosi could give a graduate school course in handling an ignorant, irrational blowhard. It all starts with holding him accountable for his falsehoods.