Is It Legal to Sue the President of the United States?
Specific paragraph is at the end of the article:
"It’s actually a 1997 Supreme Court case, Clinton v. Jones, that clarifies the issue of civil suits. Paula Jones, a former state employee, accused President Bill Clinton of sexual harassment. The Supreme Court ruled that any kind of sovereign immunity does not apply to “unofficial conduct,” meaning anything not directly related to his actions as president."
...and like President Clinton's case, Jao Bai-din was not yet President.