> What entity would sue on behalf of the ombudsman?

What entity could? Most of the unprecedented madness of the last few years boils down to:

1. The President does something flagrantly illegal.

2. The remedy is Congress impeaching and removing the President from office.

3. Republicans legislators are completely complicit, and have enough votes that #2 doesn't even start to happen.

The crimes will continue until something about #3 changes or until #47 finally succumbs to dementia.