US President Donald Trump said during the World Economic Forum that climate activist Greta Tonberg should focus her attention on countries that really pollute the environment, not the United States.

"She ousted me in Time magazine," Trump added, in an indication that Swedish environmental advocate Greta Tonberg was awarded the title of American Time magazine "Personality of the Year" in 2019.

"I think Greta should start working on those other countries," Trump told a news conference at the end of his participation in the annual summit in Davos, Switzerland.

When asked if he thinks there is a "lie" related to the climate, Trump said that "some aspects are so." Adding that he would like to meet his colleague at the World Economic Forum Tonberg in Davos.