DAVOS, Switzerland, Jan. 26 (Xinhua) -- U.S. President Donald Trump said Friday that the U.S. supported free trade but it needs to be fair and it needs to be reciprocal.

"We cannot have free and open trade if some countries exploit the system at the expense of others. We support free trade but it needs to be fair and it needs to be reciprocal," Trump told global business elite at the World Economic Forum.