“Given the complexity of the medical condition, further days of clinical stability are required,” an evening bulletin stated.
The pope has been the leader of the Catholic Church, with its approximately 1.4 billion faithful worldwide, since March 2013.
The clinical condition of Pope Francis, who is suffering from pneumonia, has improved slightly, the Vatican said late on Thursday.
French Cardinal Jean-Marc Aveline also did not rule out resignation.
The pope also had to stop his sermon midway and asked a colleague to finish delivering the rest of the address.
The pope described the crackdown on irregular immigration initiated by Mr Trump as a “major crisis” for the United States.
Mr Trump was sworn in as the 47th U.S. president on Monday.
The relationship between Pope Francis and Mr Trump is considered tense.
Enriched by unpublished photographs and personal anecdotes, the memoir offers a rare glimpse into Pope Francis’s private and public life.
“If a candidate remains chaste, his sexual orientation should not disqualify him from entering the priesthood,” the Vatican document stated.
