This should have happened in the first place. I can't imagine why they were not invited to bid.
No American company wanted it. Would you want to deal with the liability issues and the Teamsters?
American companies DO NOT want it taxes are to high!
Do you have any evidence that Halliburton was "not invited to bid?"
DPW offered to buy out P&O ( a BRITISH company ) and they accepted that deal.
Halliburton nor any other American company, were looking to buy P&O.