I'm not sure you need a warrant? The "Third Party" doctrine in the USA still hasn't been totally over-ruled, and therefore any information you give to third parties is considered fair game via subpoena, which is vastly lower standard than a warrant.
(this is missing a key case, a 6th Cir. opinion, not SCOTUS sadly, but concerns emails being intercepted... I will update Wikipedia as soon as I can remember the cite)
These searches were obtained by serving Google with a search warrant, as it says in the charging documents from which these quotes were ragescreenshotted.
https://en.wikipedia.org/wiki/Third-party_doctrine
(this is missing a key case, a 6th Cir. opinion, not SCOTUS sadly, but concerns emails being intercepted... I will update Wikipedia as soon as I can remember the cite)