Bradley Manning's lawyer said his client chose this moment to announce a new identity to avoid overshadowing the court case.
Manning "wanted to wait until the case was done to move forward to the next stage of her life," lawyer David Coombs told NBC's Today show.
"As far as the hormone therapy - yes, I'm hoping Fort Leavenworth [where Manning will be jailed] would do the right thing and provide that," he said.
"If Fort Leavenworth does not then I'm going to do everything in my power to make sure that they are forced to do so."
He added that Manning's goal was not necessarily to be in a female-populated prison but "to be comfortable in her skin and to be the person that she has never had an opportunity to be."
More top news
A six-year-old boy playing with a gun fatally shot his younger brother, 4, in the head, authorities said.
A band of rain will approach from the west today and threatens to be heavy at times.
Drugs mule Melissa Reid was caught smuggling £1.5 million of cocaine out of Peru so she could "boast about it" to friends in Ibiza.