Justice Ketanji Brown Jackson issued a dissent in the Supreme Court's presidential immunity ruling arguing it "breaks new and dangerous ground."

"So, how does this new Presidential accountability model work? An initial problem is the lack of clarity regarding what this new model entails," she wrote.

Jackson added that the ruling "unilaterally altered the balance of power between the three coordinate branches of our Government as it relates to the Rule of Law, aggrandizing power in the Judiciary and the Executive, to the detriment of Congress."

Jackson and Justice Sonia Sotomayor both penned dissents. Justice Elena Kagan joined Sotomayor in her dissent.

The split 6-3 opinion was authored by Chief Justice John Roberts.

In her dissent, Justice Sonia Sotomayor pushed back against the conservative justices' ruling on former President Donald Trump's immunity case.

Sotomayor contended in her dissent that the ruling "makes a mockery of the principle, foundational to our Constitution and system of Government, that no man is above the law."

She argued the conservative justices invented "an atextual, ahistorical, and unjustifiable immunity that puts the President above the law."

"That holding, which will prevent the Government from using a President's official acts to prove knowledge or intent in prosecuting private offenses, is nonsensical. Argument by argument, the majority invents immunity through brute force," she added.

Sotomayor also said the ruling opens up the possibility that when a president uses their official powers in any way, they will be "insulated from criminal prosecution."

"Orders the Navy's Seal Team 6 to assassinate a political rival? Immune. Organizes a military coup to hold onto power? Immune. Takes a bribe in exchange for a pardon? Immune. Immune, immune, immune," Sotomayor wrote.

Justices Elena Kagan and Ketanji Brown Jackson joined Sotomayor in her dissent.

The split 6-3 opinion was authored by Chief Justice John Roberts.

Special counsel Jack Smith's office declined to comment on the Supreme Court ruling, a spokesperson told ABC News.

The court's ruling will affect whether former President Donald Trump faces a federal trial this year on four felony counts brought by Smith, including conspiracy to defraud the U.S. and obstruction of an official proceeding, for his attempts to overturn his 2020 election loss to President Joe Biden.

-ABC News' Alexander Mallin

Former President Donald Trump released a statement about the Supreme Court's presidential immunity decision in a post on his social media platform.

"BIG WIN FOR OUR CONSTITUTION AND DEMOCRACY. PROUD TO BE AN AMERICAN!" Trump wrote on Monday morning.

When the justices appeared open to the idea of some level of immunity for former presidents, it was a shock for many veteran court observers.

"It was surprising to hear, at least from some of the justices, the possibility that a president could somehow commit criminal misconduct for which they could never be held liable in court," said constitutional law expert Michael Gerhardt. "I think that has struck many people as just, up until now, inconceivable."

One point that stood out to Gerhardt was when Justice Elena Kagan pressed Trump attorney John Sauer if a president could order the military to stage a coup and be immune. Sauer said, in their view, a president could.

"The answer that she got was one of the most disturbing I've ever heard at the Supreme Court," he said.

Read more about reaction to the April arguments here.