President Donald Trump's steeper global tariffs came into effect Thursday, leaving dozens of US partners scrambling to secure relief from soaring levies that are rewriting global trade practice.

Shortly before the new rates kicked in, Washington also announced it would double India tariffs to 50 percent and hit many semiconductor imports with a 100-percent duty.

Trump's tariff policy is a demonstration of economic power that he hopes will revive domestic manufacturing by keeping out imports, but many economists fear it will trigger inflation and lower growth.

In his latest move, the president raised import duties from 10 percent to levels between 15 percent and 41 percent for a list of trading partners.

Many products from the European Union, Japan and South Korea now face a 15-percent

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