White House National Economic Council Director Gary Cohn said last Tuesday he was resigning, as Donald Trump's administration prepares to impose tariffs on imported steel and aluminum.
Trump announced on March 1 that his administration planned to impose a 25% tariff on steel imports and a 10% one on aluminum, as these imports threaten US national security.
Cohn, a "globalist" within the White House, has been mounting a last-ditch attempt to head off Trump's new tariff plan on steel and aluminum.
He has summoned executives from US companies that depend on aluminum and steel to meet with Trump.
Trump, however, reiterated his commitment to slapping tariffs on steel and aluminum last Tuesday.
"It has been an honor to serve my country and enact pro-growth economic policies to benefit the American people, in particular the passage of historic tax reform," Cohn said in a statement.
"I am grateful to the President for giving me this opportunity and wish him and the Administration great success in the future."