They are doing what they can.
If they have not initiated impeachment of Holder and Obama for crimes and failure of national security breaches committed so far, then they are clearly not doing all they can.
You are typical of the people, unfortunately many in congress, who shrug their shoulders and just wait to bitch about the next scandal.
If you would like me to add a longer list of charges for the impeachment, I can or you can just look around. Some guy does a post of Obama’s foibles from time to time. Many items on that list, standing alone, could be considered impeachable. Taken together they constitute an ominous list.