Supposed Irrelevance of Proposed Witnesses in Impeachment Trial Couldn’t Be Determined Until After Questioning

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If the Republican senators want to call-in witnesses to the impeachment trial whom the Democrats say are irrelevant to the case at hand, then shouldn’t the Democrats be eager to prove those witnesses are (supposedly) irrelevant, thus making the Republicans look bad, and wouldn’t the Republicans be calling-in witnesses which they know will expose the Ukraine Hoax perpetrated to frame Trump?