I can understand the Iraq war thing you say. It is between the companies & their govt. One govt. So it's a win-win both ways. US govt gets money for war & they get post war deals.
But here 2 govts aere involved at the moment. Defence ccontractors are nowhere in the picture as yet. Next they have to deal with a foreign party ( Congress you said not Indian govt). And by the time that the bidding & awarding of contracts come into play ( which could be more than a couple of years away) the congress could be sitting in the opposition !!! So what happens to all that money? And even if they are in govt,. what prevents them from awarding the contract to another contractor?
So it is too far fetched an idea to think that Congress has been paid off to get this deal through !! Doesn't pass muster logically.
