Mueller did the same thing as the Watergate investigation, he laid out the case for Congress to draw a conclusion on impeachment. In short, his entire effort was to layout the evidence for an impeachment inquiry to draw a conclusion, which exactly what the Constitution intends. If the House does not open an inquiry then it is discrediting Mueller’s work and not upholding their own oath to the Constitution. In the end, they might not draft articles of impeachment, but they absolutely should open the inquiry.
Props to Amash for having the integrity to put his oath over party loyalty.