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!"

The court reporters read out the portions of then-National Enquirer publisher David Pecker's testimony about his June 2016 call with Trump, under questioning from prosecutors.

Q: And could you tell us about the conversation you had that day with Donald Trump?

A: Yes. When I got on the phone, Mr. Trump said to me: "I spoke to Michael. Karen is a nice girl." "Is it true that a Mexican group is looking to buy her story for 8 million dollars?" I said -- I said: "I absolutely don't believe that there is a Mexican group out there to buy a story for $8 million dollars." And then he said: "What do you think I should do?" I said: "I think you should buy the story and take it off the market."

Q: So when the subject of Karen McDougal came up, Donald Trump described her as a nice girl?

A: Yes.

Q: Based on your conversation with Mr. Trump, did you have an understanding as to whether he was aware of the specifics of Karen McDougal's description of the affair?

A Yes, I did.

Q: What made you come to such an understanding?

A: I think that Michael Cohen gave him the -- spoke to Donald Trump, which he said he was going to -- which -- excuse me -- which Donald Trump said on the phone that, "I spoke to Michael." And I believe that when Mr. Trump said that to me over the phone that she was a nice girl, I believe that he knew who she was --

Q: Why would you recommend to Donald Trump purchasing the story?

A: I believed the story was true. I think that it would have been very embarrassing to himself and also to his campaign.

Q: After your conversation with Donald Trump, did you have another conversation with Michael Cohen?

A: Yes. On the conversation with Donald Trump, he said to me, clearly, that he doesn't buy stories because it always gets out. And he said to me that Michael Cohen would be calling me. He was going to speak to Michael and he would be calling me back.

A: I said that -- that, "This story about Karen, since she's claiming that she has a relationship with you, should be taken off the market." And Mr. Trump said, "I don't normally -- I don't buy stories because it always gets out." And then I said, "I still think you should buy the story." And Mr. Trump said to me, "I'll speak to Michael, and he'll get back to you."

Q: And so, as you sit here today, you remember that during that conversation, you said to President Trump: It is my understanding that she doesn't want her story published?

A: (Pause). Yes. I did. I remember saying that.