So there's gonna be a limit on how long and far they can fish! Something they haven't had for 3+ years now.
Senate doesn’t do investigations. That’s the job of the House.
Democrats can present their case and let the Senate decide whether it warrants the President’s removal from office.
As things stand, he’ll be acquitted.
Since they’re not sure about their case and they appear to be having buyers remorse, why did the Democrats impeach Trump?
This is all on them and its not the GOP’s job to prosecute the President for them.