A Miami Beach man is behind bars after making an online threat to kill President-elect Donald Trump, authorities said.

Dominic Puopolo, 51, was arrested Tuesday and charged with making the threat on his Twitter account, according to an arrest report.

In a video posted Monday, Puopolo said he would be at the inauguration of Trump on Friday in Washington D.C. and would kill him, the report said.

In the video, Puopolo asks, "What are you going to do about it, Secret Service?"

Miami Beach Police arrested Puopolo after seeing him leaving a fast food restaurant on Washington Avenue Tuesday afternoon, arresting him several blocks away.

Puopolo later confessed to detectives that he did make the threats. He was being held on on $1 million bond Wednesday, jail records showed. No attorney information was available.

Police said Puopolo has made threats in the past against the mayor of Miami Beach and law enforcement.

NBC 6 interviewed the suspect in the past about his mother who was killed in the Sept. 11th terror attacks. His mother was on board one of the hijacked planes flowns into the World Trade Center. Hillary Clinton delivered the eulogy at his mother's funeral.

Miami Beach Police said Puopolo is mentally ill and had been Baker Acted before.