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!"

After he was found guilty on all counts in his historic criminal hush money case, former President Donald Trump angrily walked out of the courtroom and said, "The real verdict is going to be Nov. 5, by the people. And they know what happened here and everybody knows what happened here."

"This was a rigged, disgraceful trial," the former president told reporters. "I'm a very innocent man."

Trump blamed the Biden administration and Judge Juan Merchan.

"This was done by the Biden administration in order to wound or hurt an opponent, a political opponent, and I think it's a just a disgrace," he said, without evidence. "And we'll keep fighting, we'll fight 'til the end and we'll win."

"This was a rigged decision right from day one, with a conflicted judge who should have never been allowed to try this case -- never. And we will fight for our Constitution," he said.

Prosecutor Josh Steinglass laid out the DA's case for why Trump should be found guilty of falsifying records, even if he didn't pen them himself and just directed it to be done.

"Tarasoff may be doing the typing, but the defendant is causing the false business records," Steinglass said, referring to Trump Organization accountant Deborah Tarasoff.

Steinglass said Trump "doesn't want to leave a paper trail" and instead would "have his lackeys do it."

"If Trump didn't know about the scheme, why was he just signing the checks 'for services rendered' for $35,000 each month?" Steinglass asked.

"Does he call Cohen and say, 'Why'd I pay you $35000 for nothing?' No. He just signs it. Every month. He never once picks up the phone, he never once makes further inquiry," said Steinglass.

"Despite his frugality and attention to detail, the defendant didn't ask any questions. Because he already knew the answers."