Liar.
How could Joe threaten to withhold US foreign aid before we started giving foreign aid to the Ukraine?
We should never have been giving the Ukraine foreign aid.
And whether or not Joe had anything to do with the inappropriate aid to the Ukraine, clearly the Ukraine thought that paying kickbacks to Hunter was part of the deal.
But Joe threatening to withhold aid over payments to Hunter, would not have been made in public, since that is illegal.
So it is foolish for you to claim any more proof is necessary other than the payments to Hunter themselves.
If the kickbacks to Hunter were not in response to threats, then why did the Ukraine make these payments?
Clearly they were not for services rendered, because Hunter admits he did absolutely nothing in return for the payments.
But Joe did clearly threaten to withhold payments over Shokin investigating Hunter, which again is more than enough proof of guilt by both Bidens.