The former Tory MP whose porn-watching in Parliament sparked a by-election has said Boris Johnson needs to "face reality".
Conservative Neil Parish quit as MP for Tiverton and Honiton last month after admitting to twice looking at X-rated material in the Commons chamber.
Mr Parish tried to claim he'd been googling farm machinery when he stumbled across explicit content.
His departure triggered a contest in the Devon seat, which was won by the Liberal Democrats in a major blow to the Tories.
Lib Dem candidate Richard Foord overturned the 24,000 Conservative majority in a night of drama, which also saw Labour regain Wakefield from the Tories.
The results have left Mr Johnson facing renewed questions about his future only weeks after he survived a Tory vote of no confidence in his leadership.
Amid Tory recriminations over the loss of true blue Tiverton and Honiton, Mr Parish waded in to say his former constituents had made their views clear.
He told BBC Radio Devon: "What is becoming increasingly necessary is for the party, the MPs to consider what is the long-term position of the Prime Minister.
"The public are concerned. The people in Tiverton and Honiton have spoken and they've spoken loudly".
He added: "What we can't do is ignore people. It is for the Prime Minister to look at this very seriously.
"The time for blustering I'm afraid is over, we've got to really face reality now."
Mr Parish, who held the seat for nearly 12 years, said the result was "a shock and of course very much a sort of national vote really".
He said the Conservative candidate to succeed him, Helen Hurford, "ran a good local campaign" but that "the party paid the price" for people's concerns over the cost of living and the farming community's unease about agriculture policy reforms.
"You can try and run a very good local campaign but we have a presidential-style of party politics in this country more than ever now, and of course it is the leader of your party and their reputation that is up for trial, especially in a by-election," he said.
He said he "mainly" saw the result as a vote against Mr Johnson, adding MPs would have to decide whether the Prime Minister is a winner or not.
"At the end of the day it was a very safe seat, I did work hard and went cleanly and I think the emphasis now is for the party, the MPs to make that decision," the former MP added.
He also told Times Radio the Prime Minister should "consider his position", saying: "It wasn't just Boris alone, but of course naturally that's where the Liberal Democrats pitched it, and in fairness they won fair and square."
On his resignation, the 66-year-old said it was "a shame that I had to make such a terrible mistake and go in the way I had to go".
Asked how he was feeling after his party's by-election defeat, he said: "I have Covid so I'm not feeling too well generally."
