SCOTTISH Tory MPs have finally come out against Boris Johnson with four out of the party's six Commons politicians calling on the PM to go.

Conservative MPs have been voting on whether to remove Johnson after a no-confidence vote was triggered when more than 15% of them submitted letters to the 1922 Committee.

Scottish Tories remained tight-lipped on Johnson's position but after casting their vote have largely come out against the PM.

Joining Scottish Tory leader Douglas Ross in calling for Johnson to go are John Lamont, Andrew Bowie and David Mundell.

READ MORE: LIVE BLOG: MPs vote on on whether to sack Boris Johnson as Prime Minister

John Lamont MP, who resigned as principal private secretary to Foreign Secretary Liz Truss in order to vote against Johnson, said he had become “increasingly concerned” with his leadership.

Speaking to Sky News, Lamont said: “It was a very tough decision over the course of today – I spent many hours reflecting on what decision I was going to take.

“I consulted with my constituents on the Scottish Borders to find out what they would like me to do and how they felt about the Prime Minister’s performance, and ultimately decided that I couldn’t give the Prime Minister support, and that was a very hard decision.”

Asked why he voted “no confidence”, he said: “I had become increasingly concerned about the activities that had been widely reported had been going on in Downing Street.

“I had become concerned at the culture in Downing Street and I was becoming increasingly alarmed, I suppose, that a lot of the good work that the Government had been doing both in Scotland and across the United Kingdom was being lost by this distraction by constantly having to explain these events that have been going on in lockdown in Downing Street.

“I feel the Government needs renewed focus and perhaps a new leader will provide that.”

Another Scottish Conservative MP, Bowie, said he made the “extremely tough decision” to vote against the Prime Minister.

“Tonight, and with a heavy heart, I have taken the extremely tough decision to vote against the Prime Minister,” Bowie tweeted.

READ MORE: Scottish Tory MPs slammed for 'silence and inaction' ahead of confidence vote in PM

“I have not taken the decision lightly, at all, but after listening to my constituents.

“They remain understandably angry and upset at what has happened, this was the only choice for the good of the country.”

Tory MP and former Scotland Secretary David Mundell said he voted against Boris Johnson in the confidence vote.

“After a difficult couple of years and listening to the views of my constituents, I voted tonight for a fresh start and new leadership for our country,” he tweeted.