From Wikipedia:

Land Back, also referred to with hashtag #LandBack, is a decentralised campaign by Indigenous Australians, Indigenous peoples in Canada, Native Americans in the United States, other indigenous peoples, and allies alike, that seeks to reestablish Indigenous sovereignty, with political and economic control of their ancestral lands.

This question resolves YES if a sitting member of U.S. Congress express support for #LandBack (including just by making a social media post with the hashtag as long as it's clear that they're referring to this movement), even if they retract their statement afterwards, and NO otherwise.