SAN FRANCISCO (AP) — Tommy Wu was once a fast-rising banking executive who transformed a sleepy Chinatown savings and loan into an international financial institution.Now he's facing mounting legal problems that include Securities and Exchange Commission charges that he lied about the health of United Commercial Bank, which federal regulators shuttered in 2009 and is now in bankruptcy court.The government-appointed bankruptcy trustee alleges that Wu's desire to purchase a mainland China bank and garner world-wide acclaim are to blame for United's failure. A portion of the SEC charges alleges that Wu covered up United's rapidly deteriorating financial position to qualify for nearly $300 million in government bailout. That taxpayer money was lost when United went out of business.Regulators estimate that the bank's failure will ultimately cost taxpayers more than $3 billion.