Chiang, who steered the economics ministry before Wang, said he does not know Su or have a clear memory of the Zanadau project.
But he said it was the former KMT government's policy to encourage establishment of industrial-commercial complexes.
"The ministry would be more than happy to promote any investment plan that could help stimulate the economy and provide job opportunities," said Chiang, now the legislature's vice speaker.
The speedy conversion of the cheap farmland where the mall was to be situated into an industrial-commercial zone is said to have contributed to its steep rise in value.
Both Wang and Chiang urged investigators to get to the bottom of the controversy, saying their characters could withstand the severest test.
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