The U.N. has called for an immediate halt to a new round of trading restrictions in the U.K. amid fears that Britain could be forced to quit the EU if it fails to accept the Brexit agreement.
The U.J. Mercantile Exchange opened for trading Tuesday, ahead of a planned vote on Monday in the European Parliament.
The stock market opened for the first time on Friday, but it is unlikely to reach a new record because of uncertainty about the negotiations.
The stock market rose sharply on news of the vote, climbing from a one-month low on Friday to an all-time high.
U.P.S., the biggest stock index in the world, rose more than 20% in after-hours trading.
Gold futures for March delivery rose $1.26 to $1,270.19 an ounce, while the greenback gained $1 to $2,065.20 an ounce.
The dollar fell to 94.17 yen, down from 94.40 yen earlier in the session.