Bernie Sanders and Gavin Newsom become adversaries over push to tax California billionaires

The article claims Bernie Sanders is coming to Los Angeles to campaign for a proposed "billionaires tax," leading to an uproar and divisions with Gavin Newsom. While verification sources confirm the existence of a billionaire's tax proposal in California (Source 1) and Sanders' general association with such taxes (Source 3), the specific claim of Sanders coming to Los Angeles to campaign for this tax is not explicitly corroborated. The idea of Newsom and Sanders becoming adversaries is an inference from Newsom's stated position on the tax (Source 1).