Boris Johnson Quits as U.K. Foreign Secretary Amid Brexit Turmoil

Exit comes in wake of David Davis’s resignation as minister in charge of Britain’s negotiations to leave the EU

U.K. Prime Minister Theresa May was battling Monday to overcome her biggest crisis since she lost her parliamentary majority in last year’s general election after Foreign Secretary Boris Johnson became the second prominent supporter of Britain’s departure from the European Union to quit her government in less than 24 hours.

Mr. Johnson’s resignation, announced by Downing Street in a brief statement, followed that of David Davis, the minister in charge of Britain’s negotiations to leave the EU.

Mr. Johnson is a longtime figurehead for the fervently anti-EU wing of the ruling Conservative Party and his departure increases the chance that Mrs. May could face a formal challenge to her leadership.

Downing Street didn’t elaborate on the reasons for Mr. Johnson’s resignation but it is likely that, like Mr. Davis, he quit in protest at the terms of a new Brexit plan agreed by the cabinet on Friday. Mr. Johnson didn’t immediately comment.

The British pound fell 0.2% to $1.3256 and 0.3% against the euro after Mr. Johnson’s resignation, having earlier traded higher after news of Mr. Davis’s exit.

The resignations of Mr. Johnson and Mr. Davis increase the chances of a leadership challenge to Mrs. May from lawmakers in her Conservative Party unhappy with her plan to keep the U.K. economy closely tied to the EU after Brexit. Steve Baker, a Brexit…

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