After his father and half-brother were arrested for plunder on April 25, 2001, Ejercito was among the politicians who spoke against the Second EDSA Revolution at pro-Estrada rallies that preceded the May 1 riots near Malacañang Palace.

His given name Joseph Victor is derived from his father and the latter's electoral protest victory to become San Juan mayor in the same year, respectively.

[9] He attended Xavier School for his primary and secondary education and completed his Bachelor of Arts in Political Science at De La Salle University.

Despite his father's removal from office as President of the Philippines due to the Second EDSA Revolution a month prior, Ejercito stated that in San Juan, "there is still a strong clamor for me to run.

[19] On April 6, 2016, Sandiganbayan Fifth Division issued an arrest warrant against Ejercito and four other government officials, in connection with allegations on misuse of funds during his term as San Juan mayor.

[21] Ejercito ran and launched a campaign to secure a second consecutive term in the 2019 Philippine Senate election, his candidacy was endorsed by President Rodrigo Duterte.

After conceding defeat, Estrada wished that Senator Nancy Binay would make it over Ejercito, with both senators vying for the last spot in the partial and unofficial count, Ejercito responded by telling Estrada that he placed 13th in his own hometown, “Let him speak... It’s painful to accept that even in your own bailiwick you are unwanted".