Sir Ranulph and his five-man team will cross the continent during winter over a six-month period. Going with them will be two machines to help carry their equipment.
More top news
The occasion commemorates the signing of the Declaration of Independence.
A major easing of lockdown measures in England saw pubs, restaurants, hairdressers and cinemas opening their doors again.
The president said he was “in the process of defeating the radical left”.