I think, so far, the response to this shooting has been pretty measured and reasonable. Certainly, there have been calls for greater gun control and the initial misportrayal of the shooter carrying an 'assault rifle' happened, but I don't see emotions rising the the point of congressional involvement.
Possibly in a different congressional atmosphere things would be different. But I think in this case, it's pretty obvious that the shooter was pretty superficially normal and abided by pretty much every standard of current and proposed law and, historically, pretty clearly set off all kinds of mental stability alarm bells. Yet another prototype for how gun control legislation won't catch people or prevent shootings.