Go deeper: How Theresa May’s government reached the verge of collapse

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British Prime Minister Theresa May won a snap general election last year while promising a "strong and stable" U.K. throughout the Brexit process, but the twin departures of Brexit Secretary David Davis and Foreign Secretary Boris Johnson underline just how unstable things have become within her own government.

The big question: This is the biggest test May's premiership has faced. She's survived more than a few Brexit scrapes thus far — is this the one that brings her down?