"They do say [it]. I’ve seen and I’ve read and I’ve heard and I did have one very brief meeting on it. But people are saying they are seeing UFOs. Do I believe it? Not particularly," he said.
He was quizzed by ABC News about increasing reports by US Navy pilots who have been seeing strange objects flying at hypersonic speeds.
The president added that he thought "our great pilots would know" if there was evidence of extraterrestrial activity but promised to "watch it."
Joseph Gradisher, spokesman for US Deputy Chief of Naval Operations for Information Warfare, told the outlet last month they had changed guidelines on how pilots should report such incidents after a rise in sightings in recent years.