She is running for the seat held by two-term Democratic Sen. Ben Cardin.
Fox News’ Adam Shaw and The Associated Press contributed to this report.
The Washington Post first reported Saturday that Manning has filed to run in Maryland for the seat of Democratic Sen. Ben Cardin.
She was released from Fort Leavenworth, Kan., in May.
Chelsea Manning, the former Army intelligence analyst convicted of leaking classified documents to WikiLeaks, confirmed Sunday that she’s running in Maryland for a Senate seat.
Cardin also has not filed. But campaign finance reports show that his organization had nearly $2 million cash on hand in late September.
“Yup, we’re running for Senate,” Manning tweeted three days after she filed her statement of candidacy with the Federal Election Commission.
The tweet also included a campaign video indicating her intention to run in the 2018 Maryland Democratic primary and was followed by a tweet seeking donations to her campaign.
Manning came out as transgender after being sentenced to 35 years in prison. Former President Barack Obama granted Manning clemency before leaving office last year.