The vice-president is second-in-command, and will act as president if the president dies, resigns, or is removed from office.
My initial thought, while I was reading this, was there was a mistake and we needed to put the between as and president:
... and will act as the president if ...
The vice-president will become the president, the only one in the country.
Why are we omitting the here? Any help would be appreciated.