Congress didn't take the Orlando shooter off the no fly list, the Obama administration did. There is enough stupid shit to go around without bringing congress into it. The FBI was a day late and a dollar short in the Boston Marathon bombing, involved in the Fast/Furious debacle and dropped the investigation into the Orlando shooter. Instead of wringing your hands and becoming hysterical about the majority party you need to ask why Loretta Lynch threatened Americans with arrest if they maligned a muslem and why the FBI has become so negligent?
Congress is only in it because it's up to them to pass, or not to pass, legislation covering who is no a no fly list.
Mateen is sort of an interesting case. If he had been put on a no fly list when the FBI was actively investigating him, when would he have gotten removed? When the FBI decided he had not done anything but engage in constitutionally protected free speech, or should someone stay in the data base until he/she makes a request to have some kind of due process hearing on whether they should be in the database?
I read Susan Collins will propose legislation that the senate will vote on this week or next.