10 unanswered questions about Biden's classified documents

The White House acknowledged Monday it is working with the Justice Department to investigate the discovery of classified documents at President Biden's affiliated think-tank that "appear to be" from the Obama administration, when he served as vice president. However, little information about the discovery is known.

Here are 10 unanswered questions on the classified documents that already has some Republicans calling for a deeper investigation:

How many documents were discovered?

CBS News reported it had two sources familiar with a discovery of "roughly ten" classified documents at the Penn Biden Center for Diplomacy and Global Engagement in Washington, D.C. The White House, in its Monday statement, acknowledged a discovery of "a small number of documents with classified markings." No specific number was disclosed.