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 jury specifically requested to hear the portion of the jury instruction that compared the drawing of inferences to concluding that a rain storm had passed outside.

They read as follows:

In evaluating the evidence, you may consider any fact that is proven and any inference which may be drawn from such fact. To draw an inference means to infer, find, conclude that a fact exists or does not exist based upon proof of some other fact or facts.

For example, suppose you go to bed one night when it is not raining and when you wake up in the morning, you look out your window; you do not see rain, but you see that the street and sidewalk are wet, and that people are wearing raincoats and carrying umbrellas.

Under those circumstances, it may be reasonable to infer, that is conclude, that it rained during the night. In other words, the fact of it having rained while you were asleep is an inference that might be drawn from the proven facts of the presence of the water on the street and sidewalk, and people in raincoats and carrying umbrellas.

An inference must only be drawn from a proven fact or facts and then only if the inference flows naturally, reasonably, and logically from the proven fact or facts, not if it is speculative. Therefore, in deciding whether to draw an inference, you must look at and consider all the facts in the light of reason, common sense, and experience.