Literally nobody is stopping them from investigating, and certainly nobody is making them, repeatedly claim they have evidence, and then when it's time to put up, they pee down their legs. Is it likely a huge waste of taxpayer money to investigate nothing purely to prop up the ego of one 79 year old man-child and/or to pass modern GOP purity tests? Yes, of course. But who cares? The Party of Limited Government and Cutting Government Waste continues their complete shift if philosophy!