India, June 7 -- The political earthquake that buried Trinamool Congress's legislative wing last week appears to have set off dangerous aftershocks in Parliament, with sources confirming that at least 22 of the party's 41 MPs-across both Houses-are now in active contact with the BJP and may mount a formal split as early as this week, timing it to coincide with Mamata Banerjee's arrival in Delhi for an I.N.D.I.A bloc meeting.

The number, independently corroborated by sources within the Kolkata rebel bloc, represents a near-clean sweep if accurate. To trigger the anti-defection provisions under the Tenth Schedule of the Indian Constitution and claim to be the "real" Trinamool Congress, a rebel faction needs a two-thirds majority-specifical...