Article II section IV....
You can only be impeached in office...
He holds the office of “former president of the US.” His pension is the smallest part of it. He has a well paid, by the taxpayers, staff, an expensive secret service detail for himself and his family and a slew of privileges including some control over whether or not to release his administration’s papers. Hand the latter power over the the US archivist, get rid of all the former and you’d probably save us 10s of millions every year. He grafted enough to afford his own personal security and doesn’t deserve any of the rest. Unlike Cos, there could be no jail. He’d still be a rich free old white perv flying the Lolita express, but his legacy would finally be an honest one. I’d love to see it happen.