* Australia to spend A$65 bln on ships and subs over 20 years
* PM pledges A$40 bln for domestic shipbuilders
* State official, unions say subs should be built in Australia (Recasts, adds labour union, state official, details throughout)
By Matt Siegel
SYDNEY, Aug 4 (Reuters) - Australia will spend A$89 billion ($65 billion) on ships and submarines for its navy over the next 20 years but pressure grew on Prime Minister Tony Abbott on Tuesday to spend more than half that total building a new submarine fleet domestically.
Two naval shipbuilding programmes, the A$20 billion SEA5000 Future Frigate project and the SEA1180 Offshore Patrol Vessels, would be brought forward to guarantee the continuous domestic construction of surface warships, Abbott said.
Despite that new component, Abbott is facing intense pressure from within his conservative Liberal Party, state officials and labour unions to ensure that a A$50 billion stealth submarine programme is built domestically.
The submarine bid, one of the most lucrative defence contracts in the world, will be considered separately. Germany's ThyssenKrupp TKAG.DE (TKMS), France's state-controlled naval contractor DCNS and a Japanese government consortium of Mitsubishi Heavy Industries 7011.T and Kawasaki Heavy Industries 7012.T are bidding for that contract.
TKMS is wooing anxious members of the government with the economic and political benefits of its proposal despite growing concerns about the potential political repercussions of awarding the contract to an overseas bidder.
A Japanese government team is in talks with Britain's Babcock International Group BAB.L and BAE Systems BAES.L in response to Australia's desire to have as much domestic participation in the project as possible. ID:nL3N10364V
Tuesday's announcement drew sharp criticism from South Australia state and from a powerful trade union.
South Australia, a naval and automotive manufacturing hub, is struggling with the nation's highest unemployment rate.
Abbott announced the deal in the state capital, Adelaide. Martin Hamilton-Smith, South Australia's minister for defence industries, asked why the submarines could not also be built there if the frigates are built at existing shipyards.
The powerful Australian Manufacturing Workers' Union (AMWU) signaled it would hold Abbott to a pledge before elections in September 2013 that the submarines would be built in Australia.
"A promise is a promise is a promise, and we will be holding them to honour the submarine promise right up until the next election," AMWU Assistant National Secretary Glenn Thompson said in a media release.
Abbott is also eager to deepen security ties with Japan, reflecting a U.S. desire for its two allies to take a bigger security role in Asia as China's military grows. ID:nL3N0WX17A
($1 = 1.3710 Australian dollars) (Editing by Paul Tait)