"But then again, Mr. Trump has been planning this for years, and if he really gets elected, his term would only be from 24 to 28 years, if by that time the Vice President still has an interest, we could support you to continue your campaign!"
According to the American Constitution, each President can only serve two terms.
Of course, there are exceptions.
For instance, during states of emergency, like war with another nation, term limits can be disregarded.
The famous Roosevelt of the Roosevelt Family, President Roosevelt himself, became the only President to serve four terms because his tenure coincided with World War II.
But now it is a time of peace, and the former President in front of us already had one term from '16 to '20, so once he takes office again in '24, a consecutive term in '28 is impossible.
However, considering Katherine has only served one term, she would indeed have the opportunity to run for office again.