He received a Juris Doctor in 1974 from the Georgetown University Law Center in Washington D.C.[1] Borja served as an associate justice of the Northern Mariana Islands Supreme Court from 1989 until 1993.
In the 2001 gubernatorial election campaign, Borja announced his candidacy for Governor of the Northern Mariana Islands, choosing running mate Bridget Ichihara.
[2] His opponents in the election were Republican Juan Babauta, Covenant Party candidate Benigno Fitial and Democratic former Governor Froilan Tenorio.
[2][3] In April 2010, Borja announced his candidacy as a Democrat for Delegate of the Northern Mariana Islands to the United States House of Representatives in the 2010 election.
[1] In a letter of intent to the chairmen of the CNMI Democratic Party Jesse T. Torres, Borja wrote, "I am highly qualified to fill the position of Washington delegate.