Mark Geragos can assert a counterclaim against Lukasz “Dr. Luke” Gottwald in a defamation fight stemming from his tweets thanks to a New York law enacted last year, a judge ruled on Thursday.

It’s a spinoff fight that followed the heated litigation between Gottwald and Kesha Sebert. She sued him alleging sexual assault, and he sued for defamation and breach of contract. (That matter is expected to go to trial later this year.)

In December 2014, Gottwald separately sued Geragos, who was representing Kesha, over tweets related to Lady Gaga. Geragos tweeted a link to an article about a Howard ...