Sir Ed Davey said the UK should retaliate against metal tariffs imposed by the US.
The tariffs came into effect at midnight in the US, imposing an extra charge of 25% on all steel and aluminium entering America.
"We should have retaliatory tariffs - we have to show President Trump this is bad for the American and British economy and for the global economy," Mr Davey said.
Report by Kennedyl.
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