What will he do? Try to force someone to violate his Constitutional rights?
https://www.washingtontimes.com/news/2019/sep/23/michael-flynn-pleads-fifth-wont-testify-adam-schif/
https://www.washingtontimes.com/news/2019/sep/23/michael-flynn-pleads-fifth-wont-testify-adam-schif/