Kevin - by definition, all allegations are unproven before they are investigated and, if warranted, tried. That is why newspapers identify someone caught with the murder weapon in his hands standing over his victim as "an alleged murderer."

What we can surmise with a reasonable degree of confidence is that the House investigation (no quote marks needed - there is in fact a congressional investigation) is underway because there are very serious questions about these same allegations. Given the typically hyper-partisan nature of congressional investigations, it is also reasonable to conclude we would not be witnessing a Republican congress investigating a Republican president unless they were convinced (afraid?) that there actually is something worthy of investigation.