The Indian rupee weakened past 87 per U.S. dollar for the first time on Monday, as Asian currencies slumped after U.S. President Donald Trump imposed tariffs on the country's largest trading partners,

The dollar index was up 0.3% at 109.8, while Asian currencies weakened, with the offshore Chinese yuan down 0.5% at 7.35 per US dollar.

Trump imposed a 10% duty on Chinese exports to the U.S, and 25% tariffs on Canada and Mexico, two of its top trading partners.

The Indian rupee weakened past 87 to the U.S. dollar for the first time ever on Monday in the wake of a slump in Asian currencies and equities after U.S. President Donald Trump's tariff threats became a reality.