Boris Johnson Loses to Democracy

The prime minister is effectively at war with the Parliament for which he once promised to “take back control.”

Boris Johnson has begun with defeat.

Legislators voted last night to seize control of Parliament, alarmed by the prime minister’s insistence that he will take Britain out of the European Union on Oct. 31, even if no deal with the bloc has been reached. On Wednesday, opposition legislators and rebels from Mr. Johnson’s own party will try to pass a law mandating the prime minister to ask for an extension to...