Trump climbed on Air Force One today (June 9th in Beijing time) and almost fell down.
Because of this, Trump has mocked Biden multiple times. Now it seems to be Trump's turn. The US might want to cancel the "president walking up and down the aircraft stairs" procedure.
Original article: https://www.toutiao.com/article/1834404389002244/
Disclaimer: The article only represents the author's personal views.