[Political Junkie Too]

Yes. That is the ultimate check on all three branches by We the People, but it is not a check by one branch on any of the others.

Constitutionally, Congress is the only branch with the power to remove people from the other branches via impeachment. Congress also has the power to realign the lower courts, which could result in judges losing their courts.

Internally, each chamber of Congress can expel its own members. The Executive branch can remove a President via the 25th amendment, but this intended for incapacitation or deficiency and not an expulsion over political disagreement or criminal activity. I don't think there is an internal method for the Judiciary to expel a member.

-PJ

[morphing libertarian]

The department of justice in the executive branch can investigate congress members.

I believe federal judges can be impeached.