The president has ratcheted up the rate on foreign metals to 50 percent, double the previous rate, saying the levies weren’t high enough to help the U.S. industry.

The president first announced the doubling of tariffs on aluminum and steel at a rally in Pennsylvania last week.

US President Donald Trump has signed an order doubling tariffs on steel and aluminium imports from 25% to 50%. The move hikes import taxes on the metals - key inputs in everything from cars to canned food - for the second time since March.

The ruling, handed down late on Monday by U.S. District Judge Jacqueline Corley in San Francisco, did not delve into the merits of California's lawsuit. Now, three separate U.S. a

But the court left open a path for state officials to appeal to the liberal-leaning U.S. 9th Circuit Court of Appeals.

Economic growth will slow this year and next as the trade war hampers development in the United States and around the world, the Organization for Economic Cooperation and Development said.

President Donald Trump’s turbulent tariffs are projected to cause a sharper slowdown in economic growth in the U.S. than expected.

Donald Trump’s combative trade policies have tipped the world economy into a downturn, with the US among the hardest hit, the OECD said.