[1] He has been criticized for violating the dignity of Parliament by filing for mid-term resignation to accept a position as Deputy Mayor.

Lasse Männistö was a Member of Parliament from 2011 to 2015 representing the National Coalition Party and elected with 4,866 votes.

[4][5] In May 2015, he joined the Finnish private hospital corporate group Mehiläinen as an executive in charge of outsourcing and public relations.

[1][6] Männistö was criticized in 2014 for violating the dignity of Parliament by filing for resignation mid-term to accept a substitute position as Deputy Mayor of Helsinki.

Finnish politician Laura Räty would have succeeded him as replacement Member of Parliament.