The Government is hosting one of the United States' most influential senators, Max Baucus, for a visit and Prime Minister John Key is expected to discuss the Trans-Pacific Partnership agreement with him.
Mr Baucus is chairman of the US Senate finance committee, and Trade Minister Tim Groser says he is influential on trade policy and especially trade agreements.
He is a Democratic senator of 34 years' standing and has long supported a free-trade agreement with New Zealand.
New Zealand's Ambassador to Washington, Mike Moore - a former head of the World Trade Organisation who is back home at present - said yesterday that it was in the United States' interests to complete the TPP agreement being negotiated among 11 countries - New Zealand, Singapore, Brunei, Chile, the United States, Australia, Peru, Vietnam, Malaysia, Canada and Mexico.
"They know they have to set the standard in the Asia-Pacific," he said on TVNZ's Q+A show.