I'm afraid that's not how it works in modern law in the U.S.:
"In addition to establishing that the defendant was aware of his
statement's defamatory meaning, the plaintiff also must show that
the defamatory statement is false. The falsity requirement has
evolved gradually through a two-step process. Initially, the courts
recognized that truth was a defense in a defamation suit. With
time, however, the burden of proof on the issue of the statement's
truth or falsity shifted to the plaintiff, so that now a statement is
not actionable unless it can be proven false."
https://scholarship.law.wm.edu/cgi/viewcontent.cgi?params=/c... (pp. 851ff).