So, Obama's attempts to block the judicial course over 9/11 (not to mention Bush's) are not worthy impeachment? What an absolute joke.
This has nothing to do with the judiciary. It's vetoing a legislation that would lift immunity status from the Saudi government, which every government in the world has, and allow it to be sued in US courts.
This isn't Obama vetoing the Supreme Court or overturning a ruling. It's about a disagreement over a change in legislation.