Rachel Maddow makes a good point here, why would the Republicans invite Jack Smith to testify publicly when all he would say is what he said? 

Trump was the chief propagator of  the big lie (stolen 2020 election), the fake electors, the coercion of state officials,  the frivolous, evidence-free, court challenges, the plot to have Mike Pence announce Trump had won the election, the Green Bay Sweep,  and the bloody riot at the Capitol with the gallows outside to hang Mike Pence.  There was only one leader, one beneficiary, of this desperate many armed criminals octopus, Donald Trump.