U.S. President Joe Biden has said he was surprised that classified documents were discovered in an office he used before he was elected.

Biden said he doesn¡¯t know what¡¯s in the documents, but that he believed they were handled properly by his lawyers. ¡°We¡¯re cooperating fully,¡± he said Tuesday at a news conference in Mexico City with Mexican President Andres Manuel Lopez Obrador and Canadian Prime Minister Justin Trudeau.

¡°People know I take classified documents, classified information seriously,¡± he said. ¡°I was briefed about this discovery, and surprised to learn that there are any government records that were taken there to that office.¡±