* Former leader says accusation of theft part of 'media circus'
* Criticises 'failed' new government
* Says won't return to power but will remain a politician
By Yara Bayoumy
SANAA, June 2 (Reuters) - Other Yemeni officials may have looted public funds, but former president Ali Abdullah Saleh says he was not one of them and he has challenged his authorities to find one dollar acquired ...