President Joe Biden addressed the matter of classified documents that were recovered from his private office at the Penn Biden Center for the first time on Tuesday, saying that he was surprised to learn they were there and is cooperating fully with the Justice Department's review.

"Let me get rid of the easy one first," Biden began in response to a slew of reporter questions at the North American Leaders Summit in Mexico City. "People know I take classified documents and classified information seriously."

Biden said his personal attorneys found the classified documents as they were clearing the office.

"They did what they should have done. They immediately called the [National Archives] … turned them over to the Archives, and I was briefed about this discovery and surprised to learn that there were any government records that were taken there to that office," the president added. "But I don't know what's in the documents. My lawyers have not suggested I ask what documents they were."

Biden

President Joe Biden attends a meeting with Mexican President Andres Manuel Lopez Obrador and Canadian Prime Minister Justin Trudeau at the North American Leaders' Summit in Mexico City on Jan. 10, 2023. (Reuters/Kevin Lamarque)

The documents, which were from Biden's time as vice president, were discovered on Nov. 2 at the Penn Biden Center, according to Richard Sauber, special counsel to the White House. The president used the think tank as a private office from mid-2017 until the start of the 2020 campaign.

"The documents were not the subject of any previous request or inquiry by the archives," Sauber said on Monday in a statement.

"Since that discovery, the President's personal attorneys have cooperated with the Archives and the Department of Justice in the process to ensure that any Obama-Biden Administration records are appropriately in the possession of the Archives."

MCCARTHY REACTS TO CLASSIFIED DOCUMENTS DISCOVERED FROM BIDEN'S TIME AS VP: DEMS 'OVERPLAYED THEIR HAND'

Attorney General Merrick Garland tapped U.S. Attorney for the Northern District of Illinois John Lausch, a Trump appointee, to review the matter.

Biden said Tuesday that he hopes that investigation will be finished soon.

Biden greeted by Mexico president Lopez Obrador

President Joe Biden is greeted by Mexican President Andres Manuel Lopez Obrador upon his arrival at Felipe Angeles International Airport in Zumpango, Mexico, Jan. 8, 2023. (AP Photo/Fernando Llano)

Republicans immediately reacted after the documents' existence was made public, with Sen. Tom Cotton, R-Ark., saying that "there can't be separate standards for Republicans and Democrats."

"The same rules must apply to everyone," Cotton tweeted.

Biden was critical of former President Donald Trump after FBI agents seized approximately 300 classified documents from his Mar-a-Lago home in Florida last August.

"How that could possibly happen? How anyone could be that irresponsible? And I thought, what data was in there that would maybe compromise sources and methods?" the president told 60 Minutes in September. "And it just … totally irresponsible."

Mar-a-Lago Trump Raid in Palm Beach, Florida

Local law enforcement officers are seen in front of the home of former President Donald Trump at Mar-a-Lago in Palm Beach, Florida, on Aug. 9, 2022. (Giorgia Viera/AFP via Getty Images)

CLICK HERE TO GET THE FOX NEWS APP

Democrats, meanwhile, downplayed the discovery of the documents, saying that they can't be compared to the investigation into Trump's handling of classified info.

"This is not Mar-a-Lago," Rep. Sheila Jackson Lee, D-Texas, told Fox News on Tuesday. "This is not the refusal of hundreds and hundreds of documents. There is no comparison. They were in a locked closet. They were not accessible. And that's why the appropriate process was followed. … I don't think it compares at all."