China flew spy balloons over the US while Trump was president, but nobody realized until after he left office, reports say

• Chinese spy balloons had crossed into the US at least three times under Trump, officials said.
• Trump and former defense officials said over the weekend they were not aware of this.
• But they weren't aware because the Pentagon only found out after Trump left office, reports said.

China flew spy balloons over the US while Donald Trump was president, but nobody realized until after he left office, according to multiple reports.