The dollar was buoyed above a recent 1-1/2 month low against its major rivals on Monday as forex investors awaited details on a new round of U.S. tariffs against China, which could further sour relations between the two giants.

U.S. President Donald Trump is expected to unveil new levies on China later in the day. The tariff level is expected around 10 percent, well below the 25 percent the administration had said it was considering.

The WSJ reported that China may not attend trade talks due next week as Beijing won't negotiate "with a gun pointed to its head".

The dollar index traded at 94.911, well above Friday's 94.359, which was the lowest since end-July.

USD/JPY fetched 111.98 after climbing to 112.16 on Friday which was the highest since mid-July.

Currency traders remain bullish on the greenback with net long positions of $19.2 billion, according to futures data released on Friday by Reuters and Commodity Futures Trading Commission.

The CFTC report also showed the major positioning changes were in the euro, with net longs increasing. Net shorts in sterling and the Swiss franc also declined.

The single currency and sterling each rallied last week on encouraging developments on terms for Britain's exit from the European Union, paring some safe-haven demand for the dollar.

EUR/USD was at 1.1633, down from a three-week top of 1.1721 set on Friday. Cable also retreated, pulling back from last week's peak of 1.3145 to trade at 1.3076.

The first of three Brexit summits are set for the coming week, where EU leaders hope to settle an agreement within the next two months over the terms of Britain's departure.