The move would shorten the time lawmakers have to organize an opposition vote to a no-deal Brexit. But critics accuse the prime minister of circumventing the democratic process.
The president said he was having second thoughts after hiking tariffs on Chinese goods and threatening to force U.S. companies out of China. The White House said his comments were misinterpreted.
The Trump administration is preparing tariffs on billions of dollars in imports from Europe in retaliation for subsidies of Airbus jets. The levies would hit products ranging from aircraft to wine.
Negotiators for the U.K. and the European Union have a draft agreement laying out how the U.K. will leave the EU next March, but the agreement still needs to be ratified by both parties.
"We need much time, much more time and we continue to work in the next weeks," EU Brexit negotiator Michel Barnier said. This was supposed to be the day leaders would unveil a draft trade deal.