gobsmacked by congress ( "investigatinty" President Obama and Secretary Clinton)

I just heard on the Rachel Maddow show that Congress is planning on conducting an investigation of President Obama and an investigation of Secretary Clinton!  This is utterly pointless!

Don't they realize that President Obama has got to be retired from elected politics?  After all, once you have been President, where can you go?
Can anyone picture President Obama putting up with the happy horseshit the House shit on Secretary Clinton?

What is to stop President Obama from claiming Executive Privilege and refusing to answer questions?  What is to stop him from simply walking out?

Then, there is Secretary Clinton. She is out of office but won the popular vote and should be President. She is not longer in office and given her age and the animosity against her from the Trumpies, I can not picture her running for President again. (Of course, I have been wrong many times before sadly.)