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BRUSSELS/SHANGHAI/TOKYO (Reuters) - From Japan and South Korea to Australia and Europe, officials lined up on Friday to seek exemptions from President Donald Trump’s tariffs on U.S. steel and aluminum imports, while Chinese producers called on Beijing to retaliate in kind.

Tokyo and Brussels rejected any suggestion that their exports to the United States threatened its national security - Trump’s justification for imposing the tariffs despite warnings at home and abroad that they could provoke a global trade war.

Trump signed an order for the 25 percent tariffs on steel imports and 10 percent for aluminum at the White House on Thursday to counter cheap imports, especially from China, which he described as “an assault on our country”.

(For an interactive graphic on U.S. steel products imports click tmsnrt.rs/2oPeo1z)

However, he said “real friends” of the United States could win waivers from the measures, which come into force after 15 days. In the event he exempted Canada and Mexico, fellow members of the North American Free Trade Agreement (NAFTA) which he is trying to renegotiate.

Brazil, which after Canada is the biggest steel supplier to the U.S. market, said it wanted to join the list. “We will work to exclude Brazil from this measure,” Acting Trade Minister Marcos Jorge told Reuters after meeting U.S. Commerce Secretary Wilbur Ross. Argentina made a similar case.

Japan, the United States’ top economic and military ally in Asia, was next in line. Chief Cabinet Secretary Yoshihide Suga told a news conference that Japan’s steel and aluminum shipments posed no threat to U.S. national security.

With Japan a major trade partner and international investor, Suga said that, on the contrary, they contributed greatly to employment and industry in the United States. Japan’s steel industry body also expressed concern.

The European Union, the world’s biggest trade bloc, chimed in. “Europe is certainly not a threat to American internal security so we expect to be excluded,” European trade Commissioner Cecilia Malmstrom said in Brussels.

Malmstrom told reporters the EU was ready to complain to the World Trade Organization, and retaliate within 90 days. She will meet U.S. Trade Representative Robert Lighthizer and Japanese Trade Minister Hiroshige Seko in Brussels on Saturday when she will ask whether the EU is to be included in the tariffs.

Other officials at the EU, by far the biggest trading partner of the United States by value, have warned it could take counter-measures including European tariffs on U.S. oranges, tobacco and bourbon.

Some products under consideration are largely produced in constituencies controlled by Trump’s Republican Party. Brussels has reminded Trump that tit-for-tat trade measures deepened the Great Depression in the 1930s and in the 2000s cost thousands of U.S. jobs when Washington imposed tariffs on European steel.

U.S. President Donald Trump holds up a proclamation during a White House ceremony to establish tariffs on imports of steel and aluminum at the White House in Washington, U.S., March 8,

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