Boondoggle. you don't spend five or $10 billion for 122% return. >> president trump: the time has come for a new program of national rebuilding. >> narrator: president trump proposes spending a trillion dollars on infrastructure by including private capital, he hopes to eliminate waste. >> the private sector has different incentives, they don't something unless it's affordable, because if they build up and they run out of money, they go broke. >> as for lessons learned, hawaii does offer a cautionary tale. if the bank of uncle sam dries up, cities will need to get creative and bring in a priva...