Video: Rubio saves the day

The pair had arrived to a standing ovation, but there were hushed gasps as the 90-year-old, who was leaning heavily on a walking stick, slipped and Senator Rubio leapt to catch her.

Assisted by onlookers, the senator for Florida helped Mrs Reagan back to her feet and the applause resumed. A library spokesman told CNN that she was unhurt in the incident.