WASHINGTON - Less than two years ago a Yemeni opposition party leader told a US embassy official in Sanaa about a secret plan to oust President Ali Abdullah Saleh, The Washington Post reported on Friday.Several previously undisclosed US diplomatic cables provided by the website WikiLeaks revealed that US officials were aware of Yemen's political state but largely discounted the prospect that Saleh, a key US ally in the fight against al Qaida's Yemen-based wing, could be forced out, it said.According to one cable, Hamid al-Ahmar, in a meeting with a US embassy official, laid out plans to trigger a revolt if Saleh did not guarantee fair parliamentary elections in 2011.