Britain has moved a step closer to becoming the first country to allow the creation of babies with DNA from three different people after MPs overwhelmingly backed new legislation.
MPs voted in favour of mitochondrial donation techniques by 382 to 128 in the historic Commons vote.
William Hague has said that MPs will be given a free vote today on the issue of whether or not to allow three-parent families.
The former Conservative leader said he personally would be voting yes in today's vote but that other "MPs can decide according to their own concience".
He spoke to Good Morning Britain about the controversial issue:
MPs have voted in favour of a ground-breaking but controversial technique that could see IVF babies conceived with DNA from three people.
A vote on three-parent babies, taking place today, could determine paediatric nurse Rachel Steel's chances of having her own healthy kids.
The parents of a baby with a life-limiting disorder say their future happiness will be decided by today's three-parent family vote.