US Commerce Secretary Wilbur Ross was due to hold a news briefing at 9 a.m. (1300 GMT) to announce "Section 232" national security-related tariff modifications
The Trump administration launched a national security investigation last week into car and truck imports, using the same 1962 law that he has applied to curb incoming steel and aluminium.
When China targeted key US imports in retaliation against US tariffs on $50 billion of Chinese goods in April, Trump ordered US officials to identify a further $100 billion of Chinese products the United States could hit.
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