Waqa and his wife Louisa are in Australia for a four-day official visit to Sydney, Brisbane and Canberra.
In an exclusive interview with Sky News, he said if the deal wasn't going to go ahead the 'United States would have pulled the plug' by now.
“I think if the United States was serious about it they would have pulled the plug a long time ago,” he said.
“But we know level minded and sensibleness will prevail
It's the relationship between the United States and Australia that has to be maintained there.,” he said.