POLITICIANS from across the political spectrum have criticised Boris Johnson for supporting Dominic Cummings in breaking lockdown rules.

The PM told the daily Downing Street briefing that his top aide "acted responsibly, legally and with integrity" when he travelled more than 250 miles to his parents' home in Durham during lockdown. 

Johnson also said that “some” of the allegations about Dominic Cummings’ behaviour during self-isolation were “palpably false”.

Former LibDem leader Tim Farron said the PM had caused "colossal, possibly fatal" damage.

He tweeted: “Politically, BJ has just caused colossal, possibly fatal, damage to his Conservative administration…. but he has also undone any attempt to save lives by effective public health messaging.”

Green MP Caroline Lucas also criticised the PM, saying: “Unbelievable – PM says Cummings has acted ‘responsibly, legally and with integrity’.

“In fact he’s acted arrogantly, illegally and with gross irresponsibility.

“Even by PM’s own abysmal standards, this must surely be the lowest point.”

Westminster group leader for the SNP, Ian Blackford, tweeted: “Boris Johnson told us to stay at home and to isolate if we had Covid-19. There was no caveat that this does not apply to Dominic Cummings.

“By supporting Cummings at his press conference Boris Johnson displays a failure of leadership and undermines his own public health messages.”

READ MORE: 'Breathtaking arrogance': Ian Blackford hits out at PM for supporting Cummings

Shadow foreign secretary, Lisa Nandy, tweeted: “(Boris Johnson) said Cummings was following his instincts, the rest of the country was following the rules.

“Where does that leave us if everyone now is to follow their instincts?”

Tory MP Caroline Nokes said: “There cannot be one rule for most of us and wriggle room for others."

David Warburton, the Tory MP for Somerton and Frome, said he was “unconvinced” by Boris Johnson’s defence of Dominic Cummings.

“As much as I despise any baying pitchfork-led trials by social media, I’m unconvinced by the PM’s defence of #Cummings,” he tweeted.

Shadow policing minister Sarah Jones said: "Dominic Cummings did not do the right thing and it's not acceptable for the PM to make a political decision."

SNP MP Pete Wishart said Boris Johnson's position is "utterly disgraceful".

SNP MP Stewart McDonald described the daily Downing Street briefing as "a car crash".