@vidiot_ on Twitter compiled 536 reactions from members of Congress into a simple, easily-scanned Google spreadsheet.
https://twitter.com/vidiot_/status/862202080915836928
Many haven't said a thing. Democrats seem united in criticism of Trump. Republicans are mostly silent on the matter, with a dozen or so on the record. Of those, they're about equally split between praise and criticism of the firing.
Don't expect Congress to do anything about it. Trump's gift is for grift, and the art of grift is in spotting weak assumptions. What do people think can't be done, but have no will or means to punish or prevent?