This week's dual by-election defeat saw Labour overturn a Tory majority in the northern Red Wall seat of Wakefield with a 12% swing.
Meanwhile, the Lib Dems used Mr Johnson's unpopularity in the south to turn Tiverton and Honiton yellow for the first time in almost a century with a 29% swing.
As the PM faces a "war on two fronts", the Sunday Mirror has identified the top 30 target seats for both opposition parties, where they are in second place and slim Tory majorities make them vulnerable.
All of them could be taken with a swing of 12% or less.
Thursday's double drubbing follows December's historic by-election victory for Sir Ed Davey's party in North Shropshire, where the Lib Dems defied all expectations to win the seat with a swing of 34%.
This story is from the June 26, 2022 edition of The Sunday Mirror.
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This story is from the June 26, 2022 edition of The Sunday Mirror.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 8,500+ magazines and newspapers.
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