By Ira Iosebashvili 

The dollar rose Monday, as investors piled into the currency amid worries over global trade, Brexit and big swings in U.S. stocks.

The WSJ Dollar Index, which measures the U.S. currency against a basket of 16 others, rose 0.5% to 90.69.

U.S. Trade Representative Robert Lighthizer said Sunday that the U.S. would hold fast to its 90-day deadline for the conclusion of a lasting agreement with China on trade, adding that Washington would impose punishing tariffs on Chinese imports if none is reached. The S&P 500 recovered from a steep drop earlier in the session and ended the day up 0.2%.

Some investors buy the dollar when trade tensions flare, believing the U.S. economy will be hurt less than others in a global trade conflict.

The British pound fell after Prime Minister Theresa May delayed a parliamentary vote on her government's Brexit bill, throwing plans for the U.K.'s exit from the European Union into disarray.

The pound fell 1.3% at $1.2561, its lowest 5 p.m. New York level since April 2017.

The euro fell 0.25% at $1.1358. In emerging markets, the dollar rose 1.6% against the South African rand and 0.3% against the Brazilian real.

Write to Ira Iosebashvili at ira.iosebashvili@wsj.com

(END) Dow Jones Newswires

December 10, 2018 17:40 ET (22:40 GMT)

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