Based on Star Member uponit7771's reply, evidently Star Member Takket is referring to former(?) Clinton-operative Step-in-Awful-Stuff's coming interview. Well, my two-pronged WAG is: 1.) ABC is interviewing Trump because he is the President and is running for President; 2.) ABC would gladly interview Biden for 90 minutes if Biden made himself available, because he is running for President.
A 90-minute interview with Biden would be, ummmmmm, interesting. I doubt ABC could come up with 90 minutes' worth of softball faux-questions, and if they tried it would make grossly obvious to viewers the partisan game they were playing.