Former Sun editor turned columnist Kelvin MacKenzie has said he has "buyer's remorse" over voting for Brexit, adding he fears what will come next.
MacKenzie, who was one of the louder voice advocating leaving the EU during the campaign, said he was "fearful of what lies ahead".
It makes him the most prominent "Regrexiteer", the name given to those who voted to leave the EU but were having second thoughts.
He wrote: "When I put my cross against Leave I felt a surge as though for the first time in my life my vote did count. I had power.
"Four days later I don't feel quite the same. I have buyer's remorse. A sense of be careful what you wish for. To be truthful I am fearful of what lies ahead. Am I alone?"
He then invited readers to email him to tell him whether they felt the same, so ping him a line on kelvin@the-sun.co.uk.
Just 10 days ago, Mackenzie wrote a column giving the "10 Reasons You Must Vote For Brexit" so they could "finally take control of our destiny".
His "buyer's remorse" is a small box on his regular page column in the paper on Monday.
One Tweeter joked that Mackenzie, who famously stood by his 'The Truth' headline about Hillsborough for years, was "not exactly known for admitting regret over his decisions".
His "buyer's remorse" is a small box on his regular page column in the paper on Monday.
The main reaction on Twitter was shock, as well as a suggestion that Leave voters should now have a "cooling off" period to reconsider their decision.
"Regrexiteers" began emerging on Friday after the country voted 52-48 to leave the EU.
One man, introduced as Adam during the BBC's rolling coverage of the result, said: "I'm a bit shocked to be honest. I'm shocked that we voted for Leave, I didn’t think that was going to happen.
“I didn’t think my vote was going to matter too much because I thought we were just going to remain.”