Do it and put the evidence before the American people. Fast & Furious, benghazi, funding and arming isis, facilitating the invasion of the US by illegals, using the fed gov to supress free speech and intimidate citizens into silence, Libya, Egypt, Ukraine...the list goes on and the evidence is overwhelming. If enough pressure is put on congresscritters and they're scared that they may lose their cushy jobs they just might do the right thing.
That they might not prevail because of corruption is not an excuse not to dot their Constitutional duty and forsake their oath