When President Trump comes to Manhattan next week, Russian spy planes may very well follow. After all, it's legal.

The 1992 "Treaty on Open Skies," signed by the United States, Canada, Russia and dozens of other countries, allows nations to fly over each other's territory in order to conduct surveillance. The idea was to promote openness among nations and their militaries.

Earlier this week, a Russian spy plane circled the skies over Washington, D.C. Then, it turned north, making several passes over Bedminster, New Jersey, where President Trump is currently staying.  

Ali Watkins, who covers national security for Politico, told WNYC's Kerry Nolan that in theory, it's not a huge security risk. In accordance with the treaty, U.S. officials were on board those spy planes, which were unarmed. But with tensions heightening between the two countries, the U.S. is starting to reconsider the deal.

"As we've seen this new, aggressive Russian intelligence operation against U.S. interests," said Watkins, "what exactly is the U.S. gaining or losing by having this agreement?"

President Trump is scheduled to arrive in Manhattan on Sunday. Watkins said it wouldn't surprise her if a Russian aircraft did, as well.