President Donald Trump called his decision to ground Boeing's 737 MAX planes a "big decision" and said that Boeing has to quickly find a solution.

"They have to find out what it is. I'm not sure that they know, but I thought we had to do it. We had to take a cautionary route," Trump said. "They have to figure it out fast."

"The grounding of the planes was a big thing," Trump said.

Trump still praised Boeing as "one of the truly great companies of the world" and noted that they are one of the US's "largest exporters."