Dissident Shiv Sena (UBT) MP Omprakash Raje Nimbalkar has joined the Eknath Shinde-led Shiv Sena, further deepening the crisis in Uddhav Thackeray's camp.
Uddhav Thackeray branded the rebel MPs 'traitors' and launched an outreach drive to contain the crisis.
Nimbalkar is the latest Lok Sabha member from the Uddhav Thackeray camp to switch sides amid growing rebellion within the party.
Thackeray's tour of constituencies represented by dissident MPs aims to reassure party workers.
The Shinde-led Shiv Sena's position has been strengthened with Nimbalkar's decision, while the Uddhav Thackeray-led party currently has nine Lok Sabha members.