Mayawati has finally declared her candidature for PM post. ( Anyway it will be horrible for INDIA ,if she will be PM ).She hinted it long back indirectly hinted when she said " Will not form a alliance ,if CONGRESS is a part of it".
https://www.ndtv.com/india-news/mayawati-says-she-will-not-contest-lok-sabha-elections-2010271
Mayawati Says She Will Not Contest Lok Sabha Elections
Anyway, isn't BSP supporting the Congress in MP ? It seems that BSP + SP is positioning itself to support the BJP if needed.