Uddhav Thackeray denies any potential merger between Shiv Sena (UBT) and Congress.
Six rebel Shiv Sena (UBT) MPs boycotted a crucial parliamentary meeting in New Delhi.
Thackeray criticizes the BJP's 'politics of engineering defections' as a threat to democracy.
The Shiv Sena (UBT) leader reaffirmed the party's commitment to Hindutva and Marathi rights.