Sources within NDA suggest one of the parties that may see desertion from its ranks is Sena UBT, a possibility being talked about since the alliance swept the assembly polls in Maharashtra but has gained traction now. The Uddhav Thackeray-led party has nine MPs in Lok Sabha and six of them will have to merge with another party — Shiv Sena led by deputy CM Eknath Shinde seen as the most probable option — to avoid losing membership under the anti-defection law.