[donmeaker]

Not really. Congress has legislative powers, not executive authority.

Neither does the Chief Justice have Legislative powers, nor Executive authority.

[muawiyah]

And, how is it that the Executive can limit the exercise of Legislative power? There is a single method ~ the veto!

Otherwise, Congress' power to investigate, etc., et al, is unlimited except to the extent they, themselves, agree to limit it.

The guys who wrote the Logan Act had no interest in tieing their hands in the future should their friend not be in the White House.