According to Wikipedia:

> Passed the House on December 8, 2006 (voice vote)

> Passed the Senate on December 9, 2006 (unanimous consent)

Can't pin it all on Bush Jr.

> According to Tom Davis, the Bush administration threatened to veto the legislation unless they added the provision regarding funding the employee benefits in advance with the objective of using that money to reduce the federal deficit.

Bush was responsible for the provision that kneecapped USPS to prevent them from ever funding their EV ambitions (until Biden funded NGDV in 2022)