Chelsea Manning reportedly posted a tweets tweets on Sunday night suggesting suicide, which has since been erased.
Shortly after the tweets, Manning's Twitter handle told her she was safe and talking to friends.
"Thank you all for your concern and please give it some space," it said in the tweet.
Manning, who currently lives in Bethesda, Maryland, announced he would run for the US Senate earlier this year. She was sentenced to 35 years in prison in 2013 for violating the espionage law and for sharing sensitive information with WikiLeaks
President Barack Obama commuted her sentence on his last day in office in 2017.
The candidate for the US Senate posted a picture that seemed to show a person from above
"I'm sorry – I tried – I'm sorry I disappointed you all", Manning wrote in one of the now deleted tweets, The Daily News reported. "I'm not really ready for this world – I've tried to adapt to this world, but I've disappointed you – I could not do that anymore – I can take people I do not know hate me, but not my own friends, "she added. "I tried, and I'm sorry about my failure."
Many in social media quickly jumped to their frightening tweets and asked friends to contact Manning or the authorities to ensure their safety.
The alarming news came after a debate in the social media with ABC News's former editorial editor Dawn Ennis, who criticized Manning's remark that "the election will not change anything."
Ennis, who appeared as a transgender in 2013, wrote on Twitter: "I'm looking forward to an update on Chelsea's well-being in the morning, I wish her all the best, and I expect a new wave of online anger and hate nice to all who fight, I myself will work harder. "