House Speaker Nancy Pelosi on Wednesday canceled President Trump’s State of the Union Address in the Capitol’s House chamber — drawing an angry response from the commander in chief as he blasted her as a radical leftist who doesn’t “want to hear the truth.”

Trump earlier in the day had sent a letter to Pelosi accepting her initial invitation to deliver the State of the Union — and dismissing her later request that he postpone it until after the government reopens.

The president said he had been assured that there would be no security concerns if he delivered his speech at the Capitol on Jan. 29, as initially planned.

“Therefore, I will be honoring your invitation, and fulfilling my constitutional duty, to deliver important information to the people and to the Congress of the United States of America regarding the State of our Union,” Trump wrote.

“It would be so very sad for our Country if the State of the Union were not delivered on time, on schedule, and very importantly, on location!” he concluded.

While Pelosi sent Trump an initial invitation, as per the Constitution, both the House and the Senate must vote on resolutions formally inviting him to give the address — and Pelosi replied that she had no intention of putting such a resolution up for a vote.

“I am writing to inform you that the House of Representatives will not consider a concurrent resolution authorizing the President’s State of the Union address in the House chamber until government has opened,” Pelosi wrote Wednesday as the brinksmanship between House Democrats and the White House continued to escalate.

She said she would welcome Trump to the House on a mutually agreed upon date once the partial government shutdown, which enters its record 34th day on Thursday, was over.

“Again, I look forward to welcoming you to the House on a mutually agreeable date for this address when government has been opened,” Pelosi wrote.

Trump later slammed the California Democrat in a lengthy and bitter diatribe at the White House — and predicted the shutdown fight was far from over.

“It’s really a shame what’s happening with the Democrats. They’ve become radicalized. They don’t want to see crime stopped, which we can very easily do on the Southern border,” Trump said. “This will go on for a while.”

“Now Nancy Pelosi, or Nancy as I call her, she doesn’t want to know the truth. I think that’s a great blotch on the great country we all love. She doesn’t want the American public to hear what’s going on,” Trump said.

“She is afraid of the truth and the super-left Democrats. That party is shocking. I know many people that were Democrats and they are switching over right now. They are switching over quickly,” the president continued, without elaborating.

He said Democrats are putting the nation in jeopardy, and also took aim at Senate Minority Leader Chuck Schumer.

“It’s a disgrace what’s happening. I think they’ve become a very great danger to this country, a very, very dangerous party for this country. Chuck Schumer is dominated by the radical left. He’s a puppet for Nancy Pelosi, if you can believe that,” he said.

And he insisted that Americans wanted to hear his speech from the traditional Capitol venue, not from the Oval Office, as Pelosi has suggested.

“I will say that the American people want to hear the truth. They have to hear the truth,” he said.

The Constitution states only that the president “shall from time to time give to the Congress Information of the State of the Union,” meaning the president can speak anywhere he chooses or give his update in writing.

But a joint address in the House chamber, in front of lawmakers from both parties, the Supreme Court justices and invited guests, provides the kind of grand backdrop that is hard to mimic and that Trump enjoys.

Pelosi’s snub means that the president has to find another place to present his address to the nation.

“We’ll do something in the alternative,” Trump said.

White House officials have been considering other venues for the speech, including a rally-style event, an Oval Office address, a speech in the Senate chamber and even somewhere along the US-Mexico border.

Multiple versions of the speech were being drafted to suit the final venue.

The president also went on a lengthy riff about what he viewed as his accomplishments, mentioning the economy, jobs, a low unemployment rate and the GOP’s retention of the Senate in the midterm elections.

“We get no credit for that,” he complained.

With Post wires