The 39-year old says she will do "whatever its takes" to stop Brexit after defeating Sir Ed Davey.Read more
Liberal Democrat leadership contest
The East Dunbartonshire MP received almost two thirds of the votes in the party leadership race.
Lib Dem's Ed Davey rules out a future coalition, while Jo Swinson says they must learn lessons from the last one.
The Liberal Democrats have been rebuilding after the coalition government years, and dropping to just eight MPs in the Commons.
But the Liberal Democrat leadership hopeful said he never became "Double O Davey".