Trump says he'll plead not guilty after federal indictment

House Speaker Kevin McCarthy told Fox News he believes the indictment is "going to disrupt this nation because it goes to the core of equal justice for all."

"This is a very dark day in America when you think about what they're trying to indict President Trump on," McCarthy said, falsely equating the crimes Trump allegedly committed with President Joe Biden's own handling of classified documents.

McCarthy said House Republicans "are not going to stand for it," saying he’s already talked to House Oversight Chairman James Comer and House Judiciary Chairman Jim Jordan "of things that we can do to ensure equal justice."

-ABC News' Lauren Peller

Former President Donald Trump and his aide, Walt Nauta, are set to appear in court at 3 p.m. Tuesday at a federal courthouse in Miami, according to a spokesperson for special counsel Jack Smith.

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Special Counsel's indictment against Trump unsealed

Former President Donald Trump has been charged with 37 counts, including willful retention of national defense information.

The indictment was returned Thursday and unsealed on Friday, according to his office.

Trump is expected to arrive at and depart from the Miami courthouse Friday via secure private access points that would make it impossible for the public or journalists to see him.

Secret Service spokesman Anthony Guglielmi said, "While operational security precludes us from going into specifics, the Secret Service will not seek any special accommodations outside of what would be required to ensure the former President's continued safety. As with any site visited by a protectee, the Secret Service is in constant coordination with the necessary entities to ensure protective requirements are met. We have the utmost confidence in the professionalism and commitment to security shared by our law enforcement partners in Florida.

"Miami police will also help Tuesday with "personnel, resources, detours, and/or road closures," Miami Police Chief Manuel Morales said in a statement. "We're committed to protecting everyone's first amendment right and will continue to serve our residents, business owners, and visitors while maintaining the safety of our community."

Special counsel Jack Smith said Friday that he invites everyone to read the indictment "in full to understand the scope and the gravity of the crimes charged."

"The men and women of the United States intelligence community and our Armed Forces dedicate their lives to protecting our nation and its people. Our laws that protect national defense information are critical for the safety and security of the United States, and they must be enforced," he said.

"We have one set of laws in this country, and they apply to everyone," Smith said. "Applying those laws, collecting facts, that's what determines the outcome of an investigation."

In May 2021, prosecutors allege former President Donald Trump brought some of his boxes to his Bedminster, New Jersey, property. On July 21, 2021, Trump, before and during an interview for his upcoming book, showed the writer what he called "secret information" regarding national security, prosecutors said.

"Well, with [the Senior Military Official] -- uh, let me see that, I'll show you an example. He said that I wanted to attack [Country A]. Isn't it amazing? I have a big pile of papers, this thing just came up. Look. This was him," Trump said, according to prosecutors. "They presented me this--this is off the record, but—they presented me this. This was him. This was the Defense Department and him."

"Secret. This is secret information. Look, look at this," Trump said, according to prosecutors.

"See as president, I could have declassified it," Trump said, according to prosecutors.

"Now I can't, you know, but this is still a secret," Trump said, according to the indictment.