While Joe Biden and his team publicly insist that he is staying in the race, privately people close to him have said that he is increasingly accepting that he may not be able to, and some have begun discussing dates and venues for a possible announcement that he is stepping aside, the New York Times reports.
"One factor that may stretch out a decision: advisers believe that Mr Biden would not want to do it before Prime Minister Benjamin Netanyahu of Israel visits Washington on Wednesday US times at the initiative of Republicans to address congress, unwilling to give Mr Netanyahu the satisfaction given their strained relations lately over the Gaza war," the newspaper reported.
Mr Biden "bristles at pressure and those pushing him risk getting his back up and prompting him to remain after all. Two people familiar with his thinking said he had not changed his mind as of Friday afternoon [US time]," it said.
The US website Politico reported allies of Vice President Kamala Harris were trying to ensure she replaced Mr Biden as Demovratic presidential candidate if he stepped aside, quoting "five people involved in the project or with knowledge of the discussions".
These efforts had not been sanctioned by Ms Harris or her team, it said.