Americans are firing back at a Missouri state senator who said she hoped President Trump would be assassinated.

State Sen. Maria Chappelle-Nadal (D) wrote "I hope Trump is assassinated" in an August 17 post on her Facebook page. She initially refused to apologize, but did so four days later.

A petition to remove Chappelle-Nadal from office and jail her for threatening the president has garnered more than 15,600 signatures as of Tuesday afternoon.

"We cannot allow someone such as a State Senator who knowingly knew her position, took it for granted and used that to say whatever she wanted against our current President of the United States," the petition states.

Chappelle-Nadal later apologized, saying, "I didn’t mean what I put up. Absolutely not. I was very frustrated. Things have got to change."

Dems Are Torn on Whether Obama Should Be in Spotlight for Midterms

Veteran Reacts to Trump's Afghanistan Speech: 'You Have to Fight for the Freedom We Enjoy'

Democrats have roundly condemned Chappelle-Nadal, including state Rep. Joshua Peters, D-St. Louis, who formally requested that she be removed and called her “an embarrassment nationally for the Missouri General Assembly.”

Chappelle-Nadal has a history of vitriolic interactions during her career, including getting into a fight with another state senator at a concert over police legislation.

A Secret Service investigation is looking into her comments.

'Blood on Your Hands!': Charlottesville Council Meeting Devolves Into Chaos

American Flag Flies Upside-Down Over PA School; Veteran Outraged