By Krista Hughes, Jun. 2, 2015, Reuters/Yahoo

WASHINGTON (Reuters) - Whistleblower website WikiLeaks offered a $100,000 bounty for copies of a Pacific trade pact that is a central plank of President Barack Obama's diplomatic pivot to Asia on Tuesday.

WikiLeaks, which has published leaked chapters of the Trans-Pacific Partnership (TPP) negotiating text before, started a drive to crowdsource money for the reward, just as U.S. unions launched a new push to make the text public.

"The transparency clock has run out on the TPP. No more secrecy. No more excuses. Let's open the TPP once and for all," WikiLeaks founder Julian Assange said in a statement.

Nine hours after the campaign was launched, WikiLeaks' website was showing $25,835 pledged by more than 100 people.

The text of the TPP, which is still under negotiation and would boost the flow of goods between 12 nations from Japan to Chile, is a classified document. The U.S. Trade Representative has increased availability of the text to lawmakers, but critics complain there is still not enough oversight.