President Donald Trump on Tuesday reiterated that the U.S. Federal Reserve was raising interest rates too quickly but added that U.S. companies were "the greatest in the world" and presented a "tremendous" buying opportunity for investors.

"They're raising interest rates too fast because they think the economy is so good. But I think that they will get it pretty soon," Trump told reporters in the Oval Office, referring to the U.S. central bank.

"I have great confidence in our companies. We have companies, the greatest in the world, and they're doing really well. They have record kinds of numbers. So I think it's a tremendous opportunity to buy," Trump said after speaking with U.S. troops deployed abroad via video conference.