Jummah In Non Muslim State
In my understanding, none of the schools of jurisprudence other than Hanafi school have spelled out the requirement of a ruler. Please note that this does not automatically mean that they’re expressly against the requirement. If however, there’s a significant group that I am unaware of that disagrees with the requirement of a ruler then of course tawatur can’t be claimed. In that case the evidence provided by each side will be evaluated. Either way, the congregational Juma prayer itself still maintains tawatur.