Not Obama, he has one overseeing every department.
Why aren't republicans demanding that NO policy be implemented by these czars without a bill being put through the senate?
Because congress "delegated" the authority to create the policies used within those agencies to those agencies when congress created those agencies. The review of those policies will not be done by any over-site committee as long as the Democrats control everything. Ergo, no remedy with congress.
The only alternative is that for someone with standing to bring suit on the questionable policy issue in the Federal Court system.