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!"

Prosecutor Josh Steinglass continued to lean on the testimony of former National Enquirer publisher David Pecker, arguing it offered unequivocal evidence that Trump was in on the catch-and-kill plan involving Playboy model Karen McDougal.

Pecker testified that Trump was furious at Pecker after the Wall Street Journal published a story in November 2016 about AMI's payment to McDougal.

"This is the story that he is simultaneously telling the press he knows nothing about," Steinglass said. "Pecker established unequivocally that Trump was in on the McDougal deal."

Trump was "angry because story came out that threatened his standing with female voters," Steinglass said.

"Of course we will never know if this effort to hoodwink the American voter made the difference in the 2016 election, but that's not something we have to prove," Steinglass said. What matters, Steinglass said, is that the scheme was "cloaked in false business records to hide the conspiracy."

Judge Merchan said the jury would take its next break, then the closing would continue.

"I was watching the jurors," said the judge. "They looked pretty alert to me -- I don't think we're losing anyone."