Boris Johnson suffered a major blow to his authority as British prime minister Saturday as a senior member of his cabinet quit with a ferocious attack on his leadership.
Amber Rudd resigned as work and pensions secretary and left Mr. Johnson's ruling Conservative party, accusing him of "political vandalism" and alleging he is not trying hard enough to secure a Brexit deal with the European Union.
In a furious resignation letter, Ms. Rudd said she could not accept Mr. Johnson's decision to expel 21 Tory members of Parliament from the party over their refusal to follow his orders in a vote on his Brexit strategy this week.
"This short sighted culling of my colleagues has stripped the party of broad minded and dedicated Conservative MPs," she wrote to Mr. Johnson. "I cannot support this act of political vandalism."