(Reuters) - U.S. President Donald Trump said on Monday he told leaders of Japan and China they cannot continue to reduce the value of their currencies as doing so would be unfair to the United States.

"I've called President Xi, I've called the leaders of Japan to say you can't continue to reduce and break down your currency," Trump said at the White House.

"You can't do it because it's unfair to us. It's very hard for us to make tractors, Caterpillar here, when Japan, China and other places are killing their currency, meaning driving it down," he said.