Biden spoke for eight minutes at the Eisenhower Executive Office Building on Thursday after Republicans and some Democrats expressed concerns that his unwillingness to comment on the issue could allow conspiracy theories to thrive.
Earlier this month an American fighter jet downed a balloon sent by the Chinese government off the coast of South Carolina. The incident prompted accusations from Republicans that Biden had been too slow to react and should have shot it down before it passed over the continental US.
When three additional unidentified objects were spotted on Friday off the coast of Alaska, on Saturday over Canada and on Sunday over Lake Huron, Biden was quick to order that they be taken down.
The downing of the Chinese surveillance craft was the first known peacetime shoot down of an unauthorised object in US airspace and continues to send out diplomatic ripples.
Secretary of state Antony Blinken postponed his first planned trip to China as the balloon was flying over the US and a new meeting with his Chinese counterpart has yet to be scheduled.
