The GOP controlled Senate has had over 3 years to “discover” this coup. They’ve shown no interest in doing that so far. That won’t be changing in a Senate trial. POTUS can call his own witnesses but he’ll be flying solo there, again.
That is just foolishness
The Senate has no dog in the fight. There is no point in bitching and whining which is all the Senate could do. That is all the House is really doing.
The Senate knows that the Trump Administration has control and will destroy the Coup in totality when it so desires.
You are in effect declaring the President to be stupid.