Meanwhile White House National Security spox John Kirby says that the US is not actively tracking any balloons or other objects right now, and that Biden on Monday directed an inter-agency team to study the unidentified aerial objects.

What started out as a Chinese spy balloon shot down February 4th over the coast of South Carolina has rapidly escalated to talk of aliens.

On Sunday, the head of NORAD (North American Aerospace Defense Command) said that the Pentagon can't rule out that a spate of unidentified objects shot out of the sky over the past week might be extraterrestrial in nature. 

"I'll let the intel community and the counterintelligence community figure that out. I haven't ruled out anything," said US Air Force General Glen VanHerck, who oversees NORAD , during a Sunday press briefing at the Pentagon. "At this point we continue to assess every threat or potential threat, unknown, that approaches North America with an attempt to identify it."

What's more, VanHerck says that the military has not been able to identify how the three latest objects have been able to stay aloft.

"We're calling them objects, not balloons, for a reason," he said.

VanHerck's comments came after a US F-16 fighter jet shot down an 'unidentified object' hovering at 20,000 ft. over Lake Huron on Sunday - the third such downing in three days, and the most recent military strike in an unprecedented chain of events over North America. The object was described as an unmanned "octagonal structure" with "potential surveillance capabilities" and strings attached to it.