Both his paternal (Singson) and maternal (Crisologo) families have dominated the political environment of the Ilocos region for generations.

[3] In October 2000, Singson publicly accused his friend and then-President Joseph Estrada of plotting to assassinate him after a falling-out over the share of jueteng and tobacco revenues.

Singson's revelations helped trigger protests against Estrada, leading to his impeachment and overthrow in the Second EDSA Revolution in January 2001.

[7] After losing the elections, Singson was appointed Deputy National Security Adviser on September 5, 2008, by Arroyo.

[14] Through his conglomerate LCS Group of Companies, Singson pledged to raise $11 million needed to host the Miss Universe 2016 pageant in the country on January 30, 2017, according to Tourism Secretary Wanda Teo.

[19] Singson was also noted for his affiliation with professional boxer, Manny Pacquiao often accompanying him in trainings, press releases, and his fights.

The complaint was dismissed by the Office of the Ombudsman in February 2011, citing Santiago's parliamentary immunity.

[20] In July 2013, Singson, along with Deogracias Victor Savellano, were charged with graft by the Office of the Ombudsman following a 2002 complaint over the alleged misuse of financial assistance worth ₱26 million taken from Ilocos Sur's share in the revenues from the national government’s tobacco excise tax during their governorships.

[21] However, both were acquitted by the Sandiganbayan in August 2014, citing the significant delay before the Ombudsman formally opened a preliminary investigation into the complaint in 2012.

[23][24] However, the Civil Service Commission subsequently said that the MMDA's acceptance of the reward was a violation of ethics laws governing public employees.

[34] His youngest child a five-year old girl, was introduced to the public in an online show at Facebook Live.