Britain will not rush into a trade deal with the United States or change its food or car safety standards, Rachel Reeves, the British chancellor of the Exchequer, said in Washington on Wednesday.

When asked about reports that the Trump administration wanted Britain to lower its tariffs on cars to 2.5 percent from 10 percent, Ms. Reeves said only that she wanted to reduce trade barriers between Britain and other countries.

The British government has been pursuing a U.S. trade deal as it hopes to soften the economic blow British businesses are facing from higher tariffs imposed by President Trump on goods imported into the United States. Dozens of countries have lined up to negotiate with the Trump administration, but Ms. Reeves did not give any timeline for when an agreement would be brokered.