I believe Trump should sue her for defamation now.
I mean, if he is able to prove he didn't do it, sure. But I don't know how he would do that. And he has enough legal battles already. here is a list of indictments and lawsuits trump currently has ongoing. His lawyers are very busy.
The Manhattan DA's indictment over the hush-money settlement to Stormy Daniels
The Trump Organization Payroll Case
The Fulton County election interference probe
The Justice Department's investigation into efforts to overturn the 2020 election
The Justice Department's investigation into the handling of classified documents
lawsuits against trump
The NY AG's civil filing against the Trump family and Trump Organization
Lawsuits alleging 'incitement' on January 6
E. Jean Carroll's rape and defamation case against Trump
The 'multi-level marketing' pyramid scheme case
Michael Cohen's 'imprisonment' case
The Electric Avenue copyright case
lawsuits brought by trump
Donald Trump v. Mary Trump
Donald Trump v. Hillary Clinton