LONDON — The United States is ready to negotiate a post-Brexit trade deal with the U.K. “in pieces” to help speed the process as Britain prepares to leave the European Union on Oct. 31, National Security Adviser John Bolton said Monday.

Bolton told reporters after meeting with British Prime Minister Boris Johnson in London that a piecemeal approach to trade negotiations was “not unprecedented” and talks between the U.S. and the U.K. could start with areas where the two sides are likely to agree.

“I think here we see the importance and urgency of doing as much as we can agree on as rapidly as possible,” he said.

Johnson’s office said the prime minister and U.S. President Donald Trump’s adviser “spoke about Brexit and a range of other issues.