DOA... that’s impeachment. Senate should return indictment to the House by saying Democrats have not proved their case.
Not GOP problem to get Trump for them in the absence of ironclad evidence. That’s the Democrats’ problem.
If they can’t get their act together, its not the Senate’s business to rescue them from their own jam.
I hate to even go there, but even IF Trump said “ I will give you funding, if you do opposition research for me on the Biden’s” would that even be impeachable?