Regardless of whether the FBI is investigating Hunter Biden, to call him in to testify right now would be viewed as election interference (righty or wrongly). After the election is a different story.
The whistleblower repair shop guy contacted the GOP Senate in September. They were aware of the laptop and did nothing.
Lyndsey will never touch the Biden's corruption. Not in a million years, and all because it involves China. I'm not quite sure what China has over Lyndsey yet, but it's been working like a charm for years. That's one of the main reasons Lyndsey Graham needs to go.