The U.S. dollar hovered near its lowest since 2021 against the euro and the weakest since 2015 versus the Swiss franc on Monday, with traders alert for any trade-related headlines in the countdown to President Donald Trump's tariff deadline.

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,

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.