A former City economist and financial journalist, Huhne became an MP in 2005. He ran for the leadership of the Liberal Democrats in 2006 and again in 2007. In the latter contest, Huhne narrowly lost to Nick Clegg and was rewarded with the home affairs brief.
What is his background?
The 53-year-old was educated at Westminster School and at the Sorbonne before going on to Oxford, where he edited the student magazine Isis and gained a first in Politics, Philosophy and Economics. He is thought to be a millionaire several times over but is reluctant to talk about his investments.
Where does he sit politically?
Huhne is seen as being to the left of leader Nick Clegg. In 2007, he described himself as a 'social liberal'. At Oxford, he served on the executive of the Oxford University Labour Club.
Why he is a man to watch
Huhne has never lacked ambition or intellectual energy. He has played a key role in developing his party's thoughts on climate change and the environment and is currently helping to shape the debate on knife crime.
Something you might not know
Huhne is the stepbrother of Nicholas Watt, who is political editor of The Observer.