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Some of today's top storiesWith this excessive heat warning, health officials are asking the public to take proper precautions. Health officials are saying to start hydrating now, BEFORE you're out in the heat, and to drink plenty of water.    Electrolite drinks like Powerade and Gatorade are nice, but they can't be used just on their own.    Even if you stay indoors or have a job that's inside, experts are saying to still take this very seriously. Many people are already sweating it out and trying to stay cool  -- and it's about to get even hotter. OMAR LEWIS from our sister station KTLA has more on the heatwave's impact on southern California.A major legal win for former president donald trump.    The supreme court ruled along ideological lines in a 6-3 decision that the former president is immune from prosecution in certain cases but not all of them.    Nbc's brie jackson has the latest from washington.