This 23 August 2019 video from the USA says about itself:
Democratic National Committee (DNC) officials reversed the previous ban on candidates participating in non-sanctioned climate forums, but Carmen Bouquin of the Sunrise Movement says that’s not enough.
DEMS VOTE DOWN CLIMATE DEBATE A panel of the Democratic National Committee rejected a proposal to host a single-issue debate on the climate crisis. The committee voted 17-8 against a resolution that has become a cause célèbre for activists and for more than a dozen presidential contenders. [HuffPost]