She later served as the Member of Parliament (MP) representing Punggol East SMC between 2013 and 2015 after winning the 2013 by-election but lost her seat to Charles Chong in the 2015 general election by a narrow margin.
However, on 12 December 2012, Palmer resigned his Speaker and MP post citing that he had an extra-marital affair against a constituency director from Pasir Ris West division,[2] eventually precipitated a by-election which would be held in January 2013.
[3] On the same day, then-Secretary General of WP, Low Thia Khiang announced the party candidacy, and would field Lee to contest the seat again in the forthcoming by-election.
[5] In the 2015 General Election, Lee was announced as a candidate who would defend the constituency, and on 27 August, PAP revealed that six-term MP and Deputy Speaker Charles Chong would be the challenger.
[7] It was later revealed that Daniel Goh, a candidate part of the Workers' Party team for the East Coast GRC, would replace Lee as the last NCMP seat, on 4 February 2016.