Andrew Mitchell's lawyers sent The Sun a "letter before action" last month, putting it on notice that the Conservative MP intended to sue.
At the time, his lawyer Graham Atkins told The Guardian: "We are seeking damages, an apology, an undertaking that the words complained of are not repeated, and costs."
The newspaper was the first to break the story of Mr Mitchell's row with the officers at Downing Street, which became known as the "Plebgate" scandal.
More top news
We look back at some of the stories, people and events that stood out in 2014.
It will be a frosty Christmas morning across the UK but any chance of snow is limited to the Scottish mountains.
Fainting dogs, dancing grooms and an attacker who picked on the wrong girl all featured highly in our most-read stories of the year.