Pacquiao came out of retirement in November 2016.
The boxing promoter accused the presidential candidate of cheating.
Having rebuilt his reputation, Amir Khan faces the defining moment of his career.
Trump will be attending Saturday's fight at the new T-Mobile Arena in Las Vegas.
The English boxer believes Mayweather is missing all the attention.
Raemarni Ball, 19, met the boxer in Cannock.
Mayweather hopes to retire undefeated this year.