Days after former Shiv Sena (UBT) corporator Santosh Kharat from Worli joined the Eknath Shinde-led Balasahebanchi Shiv Sena, Sena (UBT) leader and former minister Aaditya Thackeray said he was willing to resign as the MLA from Worli and challenged the chief minister to fight the polls against him.