U.S. President Donald Trump has said that he had no knowledge that Washington imports Chemicals and fertilizers from Russia.....Trump's statement came after India said that U.S. continues to import from Russia uranium hexafluoride for its nuclear industry, fertilisers, as well as chemicals. NDTV World's Vishal Vivek sheds light on the story. A medical transport plane crashed and caught fire Tuesday on the Navajo Nation in northern Arizona, killing four people, the tribe said in a statement.