Mr Flynn made the statements during the "For God & Country Patriot Roundup," in Dallas on Sunday.
An attendee asked Mr Flynn "why what happened in Myanmar can't happen here?".
Mr Vindman took to Twitter to denounce Mr Flynn and offer his services to prosecute the retired lieutenant general.
"With these seditious remarks Comrade Flynn may have crossed the line for recall to active duty and court-martial.
Both Mr Flynn and Mr Vindman were ousted from their jobs, but for significantly different reasons.
Mr Flynn pleaded guilty to lying to the FBI concerning his deals with Russia's ambassador prior to Mr Trump taking office.
The military claimed – without evidence – that widespread voter fraud had occurred, and used the dubious allegations to justify its undemocratic actions. »