[2][3] Do fled with his family from Vietnam to the United States following the Fall of Saigon, with only the clothes they were wearing and a "suitcase full of dictionaries.

During an Orange County Board of Supervisors meeting on COVID-19 prevention efforts in July 2021, one speaker, under the pseudonym of "Tyler Durden", told Do: “You come to my country, and you act like one of these communist parasites.

[14] In March 2017, Do attempted to become the supervisor to CalOptima, Orange County's $3.7 billion publicly-funded health insurance plan for low-income citizens.

In 2024, after VAS failed to substantiate the work and show that meals were actually handed out, Orange County authorities brought on a lawsuit against VAS, accusing Chief Executive and founder Peter Ahn Pham, Secretary Dinh Mai, and Rhiannon Do, of using more than $13 million in taxpayer money on "lavish expenses" such as buying personal homes.

[19] In addition, another $1 million that was awarded to VSA to maintain the Vietnam War memorial at Mile Square Park was allegedly not completed.

[23] On October 22, 2024, the United States Department of Justice announced that Do agreed to plead guilty to conspiracy to commit bribery as a result of the Viet America Society contracts and Do's direction of taxpayer money.

[2] U.S. Attorney Martin Estrada commented that "he functioned like Robin Hood in reverse, and his conspirators stole money from the poor to give to themselves.

[3][2] The plea agreement requires Do to forfeit any assets connected to the bribery scheme, including the Tustin property his daughter purchased in 2023.

[2] Do has been beset with allegations of corruption during his career, which has led community groups as well as the Orange County Register (which had previously repeatedly endorsed Do) to call for his resignation.

[6] In the same stipulation, the commission also noted that Do violated regulations on a series of behested payments for a statue project at Mile Square Park by filing the required reports late.

While testifying as a witness during a major trial regarding a homeless services center, Do failed to disclose that his wife was the assistant presiding judge, leading to a mistrial.

[29] After becoming CalOptima chairman, he hired Veronica Carpenter, one of his longtime advisors, to the newly created chief of staff role, paying $282,000 plus benefits.

[31] In February 2022, the board abruptly fired its entire in-house legal team of attorneys and support staff in a closed session meeting.

[34] In February 2023, a day after a local non-profit news agency reported on a state investigation into CalOptima's hiring and pay practices including controversially large salary hikes, Do abruptly resigned as chair.