The prosecution's star witness, former Trump attorney Michael Cohen, called today's verdict "an important day for accountability and the rule of law."

"While it has been a difficult journey for me and my family, the truth always matters," he said.

Two senior Trump advisers who ABC News spoke with were extremely angry after the verdict.

Both said they were not surprised by the jury’s decision. One said, "The fix was always in," and the other added, "Not surprised -- it’s New York."

Donald Trump Jr., reacting to his father's guilty verdict, said, "The Democrats have succeeded in their yearslong attempt to turn America into a third-world s---hole. Nov. 5 is our last chance to save it."

The guilty verdict shows "no one is above the law," a representative for President Joe Biden's campaign said, adding, "But today's verdict does not change the fact that the American people face a simple reality. There is still only one way to keep Donald Trump out of the Oval Office: at the ballot box."

"Convicted felon or not, Trump will be the Republican nominee for president," Michael Tyler, communications director for the Biden-Harris campaign, said in a statement.

"A second Trump term means chaos, ripping away Americans' freedoms and fomenting political violence -- and the American people will reject it this November," Tyler said.

The White House offered a very brief comment, with a White House Counsel’s Office spokesperson saying, "We respect the rule of law, and have no additional comment."

Among the congressional response, Speaker of the House Mike Johnson, who traveled to Manhattan days ago to support Trump at the trial, said in a statement, "Today is a shameful day in American history. Democrats cheered as they convicted the leader of the opposing party on ridiculous charges, predicated on the testimony of a disbarred, convicted felon."

"President Trump will rightfully appeal this absurd verdict -- and he WILL WIN!" Johnson said.

Former President Donald Trump's campaign is already fundraising off of the guilty verdicts in his hush money trial, telling his supporters he has been convicted in a "rigged" trial.

"I was just convicted in a RIGGED political Witch Hunt trial: I DID NOTHING WRONG!" a fundraising email said. "They’ve raided my home, arrested me, took my mugshot, AND NOW THEY’VE JUST CONVICTED ME!" the email continues.

The email links to a fundraising page, in which Trump told his supporters, "I'm a political prisoner!"

While the jury deliberates, Trump -- from the courthouse -- posted to social media about the readback that the jury just heard.

During the readback, the jury heard former National Enquirer publisher testify about a June 2016 phone call he had with Trump after Playboy model Karen McDougal came forward with a story of a year-long affair with Trump, which Trump has steadfastly denied.

"This story about Karen, since she's claiming that she has a relationship with you, should be taken off the market," Pecker recounted telling Trump -- to which Trump replied, "I don't normally -- I don't buy stories because it always gets out."

"I still think you should buy the story," Pecker testified that he told Trump, to which Trump replied, "I'll speak to Michael, and he'll get back to you."

In his social media post, Trump said, "Testimony conclusively showed that I clearly stated, "I DON'T BUY STORIES!" -- Not that there would be anything wrong with doing that -- NDA's [nondisclosure agreements] are PERFECTLY LEGAL AND COMMON!"

Pecker testified that the National Enquirer eventually paid McDougal $150,000 to catch and kill her story so it would not become public, under the expectation that the money would be reimbursed by Trump -- although the reimbursement never materialized.

-Kelsey Walsh