President Joe Biden, for the second day in a row, dodged questions about the classified documents found at his think tank in Washington DC, as a new report claims the files contained information on Ukraine, Iran and the United Kingdom.

Biden, who is in Mexico City for a meeting of the 'Three Amigos,' ignored questions shouted to him by reporters during his sit-down with Canadian Prime Minister Justin Trudeau on Tuesday.

"Mr President, did you mishandle classified documents?' a member of the press corps shouted at him.

He merely smiled and stayed silent as White House staff escorted journalists from the room. 

The cache of documents covered topics including Ukraine, Iran and the UK, CNN reported. The boxes also contained personal Biden family documents, including materials about Beau Biden's funeral arrangements and condolence letters.

The files were discovered when Biden's lawyer saw an envelope that indicated it contained personal files, opened it and saw there were classified documents inside. 

The lawyer closed the envelope and called the National Archives, the news network reported.

Biden's team turned over several boxes out an abundance of caution, even though many contained personal materials, a source told CNN.