Reps and Senators can be charged with Treason. Many of them are guilty of that.
OK. Treason is defined in the Constitution. Only crime that is.
It has generally been interpreted as waging war on the United States or giving aid and comfort to US enemies in a declared war.
Which congressmen do you think can be convicted of such acts?
BTW, treason, aside from its definition in the Constitution, is no different from any other crime. Congressmen can be charged with any crime.