Trump's statement on DeSantis

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So recently former US President Trump released a scathing official statement on DeSantis (er, DeSanctimonious?) and specifically in regards to the 2018 FL election, said:

"Ron was going down ten thousand votes a day, along with now-Senator Rick Scott, I sent in the FBI and the U.S. Attorneys, and the ballot theft immediately ended, just prior to them running out of the votes necessary to win."

I don't like any of these guys, and Trump's account is being disputed by the FBI and DOJ — but, does anyone actually believe Trump here? Should this be investigated?

(Personally, I believe Trump is lying)