House Republican leadership is continuing to stand by Santos following the 13-count indictment. Among the House's GOP leadership, there have been no calls today for Santos to resign.

Speaker of the House Kevin McCarthy says that Santos, "like every American," will have his "day in court."

"He will go through his time in trial and let's find out how the outcome is," McCarthy said.

The speaker said that Santos "was never put on committee, so he won't serve on committee."

Asked if money laundering, wire fraud, and lying to Congress concerns him, McCarthy responded, "It always concerns me."

House Majority Leader Steve Scalise, during a press conference this morning, said that the charges were serious -- but did not call on Santos to resign.

"There's a presumption of innocence, but the charges are serious," Scalise said. "He'll have to go through the legal process."

-ABC News' Gabe Ferris, Lauren Peller and Katherine Faulders

In addition to being charged with defrauding campaign donors and falsely applying for unemployment benefits, the indictment alleges that Santos mislead the House of Representatives about his finances, specifically in to two financial disclosure forms he filed as a candidate.

in May 2020, during his first unsuccessful campaign, Santos overstated one source of income while failing to disclose his investment firm salary, the indictment says.

And in September 2022, while running again, Santos again included falsehoods in his financial disclosure forms, according to the indictment.

Santos lied about earning a $750,000 salary and between $1 million and $5 million in dividends from his company, the Devolder Organization, according to the indictment, and falsely claimed to have a checking account that held between $100,000 and $250,000, and a savings account with deposits of between $1 and $5 million.

"These assertions were false. Santos had not received from the Devolder Organization the reported amounts of salary or dividends," prosecutors said in the indictment.

Santos was placed under arrest this morning and will be arraigned on the indictment this afternoon.

He was placed under arrest on a 13-count, 19-page indictment that outlines three main schemes.

If convicted on all counts, he faces up to 20 years in prison -- though it's by no means certain he would serve that much time.

Federal prosecutors in Central Islip, New York, accuse Santos of engaging in a "scheme to defraud" his campaign donors.

According to the indictment, Santos solicited donations for his run for office "under the false pretense" that those funds would actually be used for politics.

Instead, prosecutors said Santos spent "thousands of dollars of the solicited funds on personal expenses, including luxury designer clothing and credit card payments."

Santos is also charged with illegally receiving unemployment benefits during the pandemic even though "he was employed and was not eligible for unemployment benefits," the indictment said.

Santos is also charged with lying to the House of Representatives on his financial disclosures. Taken together, U.S. Attorney Breon Peace said. Santos relied on "repeated dishonesty and deception to ascend to the halls of Congress and enrich himself."

Ryan Harris, a federal prosecutor speaking on behalf of the government, laid out the conditions of Santos' bond, which defense counsel had agreed to as "something palatable for both of us."

Among the conditions, Santos can travel within the continental U.S. -- but must notify pretrial services before doing so.

He can travel freely within and between New York City, Long Island, and Washington, D.C.

A spokesperson for the Eastern District of New York confirmed that Santos will not be required to wear an ankle monitor.

Santos' next hearing is scheduled for June 30.

-ABC News' Olivia Rubin and Lucien Bruggeman