Steve Simeonidis, chairman of the Miami-Dade Democratic Party, tweeted a photo of the Trump-supporting officer on October 20.
Simeonidis identified the officer as Daniel Ubeda. Florida State Attorney Katherine Fernandez has since confirmed it.
Shortly after the tweet was published, Miami police officials said that wearing a political mask in uniform was "unacceptable" behavior that would be "addressed immediately."
Mayor Francis Suarez of Miami also told reporters the photo was taken while the officer was in line to cast his own vote, but condemned his actions.
On October 22, Fernandez said in a statement that while she "respects" the officer's First Amendment right to express his opinion, she believes his actions were "unacceptable" for his position.
"Wearing one's police uniform at a voting site while expressing a political opinion may be construed as an official attempt to send a distinct message to potential voters," Fernandez said, adding that her office has opened an investigation.
Source: Business Insider