nuclear dispute between the US and NZ thawing out, pressure from the United States increased in 2006 with US trade officials linking the repeal of the ban of American nuclear ships from New Zealand's ports to a potential free trade agreement between the two countries. On 4 February 2008, US Trade Representative Susan Schwab announced that the United States will join negotiations with four Asia–Pacific countries: Brunei, Chile, New Zealand and Singapore to be known as the "P-4". These countries already have a FTA called the Trans-Pacific Strategic Economic Partnership and the United States will be looking to become involved in the "vitally important emerging Asia-Pacific region". A number of US-based organisations support the negotiations including, but not limited to: the United States Chamber of Commerce, National Association of Manufacturers, National Foreign Trade Council, Emergency Committee for American Trade and Coalition of Service Industries. In 2010, the United States and New Zealand signed the Wellington Declaration in Wellington, New Zealand, during a three-day visit by US Secretary of State Hillary Clinton. The signing of the declaration ended the ANZUS dispute of the past 25 years, and it was later revealed the US and New Zealand had resumed military co-operation in eight areas in 2007. On 16 November 2011, US President Obama and Australian Prime Minister Julia Gillard met in Canberra, Australia to announce plans for a sustained new American presence on Australian soil. 2,500 American troops are to be deployed to Darwin, Australia. New Zealand and the United States signed the Washington Declaration on 19 June 2012 "to promote and strengthen closer bilateral defense and security cooperation". On 20 September 2012, while on a visit to New Zealand, US Secretary of Defense Leon Panetta announced that the United States was lifting the 26-year-old ban on visits by New Zealand warships to US Department of Defense and US Coast Guard bases around the world; US Marines had trained in New Zealand and New Zealand's navy took part in the RIMPAC maritime exercises alongside the US earlier that year. The Royal New Zealand Navy (RNZN) invited the United States Navy to send a vessel to participate in the RNZN's 75th Birthday Celebrations in Auckland over the weekend of 19–21 November 2016. The guided-missile destroyer became the first US warship to visit New Zealand in 33 years. New Zealand Prime Minister John Key granted approval for the ship's visit under the New Zealand