Tung Chee-hwa spent $8 million in his unchallenged campaign for re-election, it emerged yesterday. The campaign began with a war chest of $9 million, $500,000 shy of the maximum amount permitted under election rules. The unspent $1 million will now be donated to charity. The director of Mr Tung's campaign office, Edgar Cheng Wai-kin, said $4 million was spent on salaries for 15 staff, while the rest went on rent and publicity. Campaign aides said that $9 million would not have been enough to wage the campaign had anyone come forward to challenge Mr Tung. Mr Cheng refused to give a detailed breakdown of Mr Tung's expenses, saying they would be announced when the information was declared to the Registration and Electoral Office. Campaign office chairman Leung Chun-ying said funds would have been 'tight' had anyone run against Mr Tung. 'We need many able hands to run the campaign, plus publicity . . . if there had been an opponent, do you think [the extra] $1 million would have been enough?' Mr Leung, who has been widely touted as a potential chief executive, said he had 'not considered' running for election in 2007. He was tight-lipped when asked if he would join Mr Tung's cabinet under the ministerial accountability system. 'It is not about who is interested . . . but the overall structure.' He said he would consider any offer after details of the proposal were announced.