He had to relinquished his diplomatic post in 1955 when he was drafted by the Nacionalista Party to become one of its candidates for Senator and won said election.
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Feeling betrayed, Romulo left the Liberal Party and became national campaign manager of Magsaysay, the candidate of the opposing Nacionalista Party who won the election.
After Emilio Aguinaldo surrendered to the United States, Carreón along with Macario Sakay and Lope K. Santos, among others, formed the Nacionalista Party (unrelated to the current Nacionalista Party since it was outlawed).
Cavite Representative Justiniano Montano of the Liberal Party, who was successfully included in the Liberal's 1949 Senate election ticket, supported Jose T. Cajulis of the Nacionalista Party in the elections to the House of Representatives seat he was retiring from.
During the 1971 midterm elections, Maceda was only one out of three senators elected under the banner of the Nacionalista party of then-President Ferdinand Marcos.
Arthur Defensor, Sr. ran for the governorship of Iloilo and won the polls, he also caucuses with the Nacionalista Party and Lakas-Kampi-CMD.