In a statement on Monday, Mr Rennie said: “After eleven elections and referendums over ten years and a global pandemic, I have decided to stand aside as Leader of the Scottish Liberal Democrats
“Over the last decade there have been both gains and losses along the way, but I have enjoyed every effort. I love a good campaign.
“But it is time for a fresh face to lead our party forward. The new Leader will have my full support in writing the next bright chapter of the Scottish Liberal Democrats' story.”
Scottish politicians across the board paid tribute to the work done by Mr Rennie, and many specifically mentioned the politician’s legendary photo-ops.
Here are some of our favourite pictures of the former Scottish Lib Dem leader.
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5. Willie Rennie water skies during a European Election campaign event
Willie Rennie water skies during a European Election campaign event at Water Ski & Wakeboard Scotland on May 21, 2019 in Dunfermline, Scotland. (Photo by Jeff J Mitchell/Getty Images)
Photo: Jeff J Mitchell
6. Willie meets Harvey a 7 year old boxer and therapy dog.
Willie meets Harvey.
Photo: Toby Williams
7. Willie Rennie at Edinburgh Zoo
Willie Rennie, pictured with four penguins.
Photo: Lisa Ferguson
8. Willie Rennie drives a Lamborghini Huracan supercar
Willie Rennie drives a Lamborghini Huracan supercar at Ingliston Racing Circuit at the Royal Highland Centre. Pic: Jane Barlow
Photo: Jane Barlow