One of his lawmakers calls him a "dead man walking.” Another, once a Cabinet colleague, stood up in Parliament to tell him: "In the name of God, go.” And one has even switched sides to the main opposition party.

Two years ago, Prime Minister Boris Johnson led the Conservative Party to its biggest election victory in decades. Now, after apologizing for attending a party at No. 10 Downing Street during Britain’s first and fiercest coronavirus lockdown, and then for two other gatherings held by his aides under different restrictions as the queen prepared to bury her husband, Johnson is in big trouble.

Here is a guide to just how much trouble, and what could happen next.