A personal assistant[1] who accompanies the president of the United States virtually everywhere is generally referred to as a body man or body woman, but in some cases may be referred to as a personal aide.
These personal aides to the president are often responsible for arranging and providing: lodging; transportation; interactions with media, public, and family; meals; personal briefings and briefing papers; logistical instructions; speech cards; snacks; cell phones; and any other necessary assistance.
[4] A new position was created, Personal Aide to the President.
Previously this role had largely been filled by a White House valet.
[5] This role remained, but unlike the valet, the Personal Aide to the President travels wherever the president goes whereas the valet always remains stationed at the White House.