Equity-index futures fell and the dollar dipped after President Trump said his administration may start sending out letters imposing unilateral tariffs on trading partners as early as Friday. Ahead of his July 9 deadline for trade negotiations,

Most Asian equity markets struggled on Friday and European stocks looked set to open weaker, despite record highs for Wall Street overnight, as U.S. President Donald Trump's deadline for trade deals loomed next week.

The greenback weakened 10.7% in the first six months of the year compared to a basket of currencies from major trading partners – the worst drop since 1973 when President Nixon stopped tying the dollar to the price of gold.