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!"

More than an a hour and a half into his summation, prosecutor Josh Steinglass finally turned his attention to the Stormy Daniels hush money payment.

Steinglass resumed his summation by discussing the impact of the "Access Hollywood" tape, which prosecutors argued was the impetus for the Daniels hush money payment.

"It all began with this email from this Washington Post reporter named David Fahrenthold," Steinglass said, displaying the exhibit. Fahrenthold had reached out to then-Trump aide Hope Hicks with a transcript of the "Access Hollywood" remarks to ask for the campaign's comment.

Steinglass recapped some of Hicks' testimony, saying her "initial instinct was to deny the video's legitimacy." But once the campaign saw the video, "that strategy quickly shifted from 'deny, deny, deny' to 'spin.'"

Steinglass then played a video of Trump's reaction to the "Access Hollywood" tape in which he expressed his regret.

On Oct. 8, Steinglass says, there was a "flurry of activity" as Trump's campaign sought to spin the Access Hollywood tape. Michael Cohen asked then-National Enquirer publisher David Pecker about a RadarOnline article "about Trump being a playboy" and asked him to remove it, which he did.

"This is not catch-and-kill exactly, but they are purging the internet at the direction of the campaign," Steinglass said.