Calling it a matter of national security, U.S. President Donald Trump signed a memo insisting on an investigation into the dumping of inexpensive steel products in the U.S.
He insists it's a global problem, not just limited to China.
The White House needs China's help in dealing with North Korea.
U.S. President Donald Trump wants to defend American workers.
IN: "This investigation...
OUT: ....but our companies."
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