The Conservative Party yesterday banned the Daily Mirror from travelling on the party’s battle bus.
Senior Tory aides told the Mirror as early as last week they could have access to the trip - the Tory leader’s first with the bus - but pulled the offer at the last minute.
Our reporter was then blocked from boarding the red, white and blue emblazoned campaign coach when she arrived in Manchester city centre, where it set off just before 8am.
As the bus headed for crucial electoral battlegrounds in the north east with Mr Johnson, our correspondent was forced to wave goodbye.
The vehicle whisked hacks up to Bishop Auckland where they visited the UK’s only washing machine factory, before visiting an engineering plant in Middlesbrough.
The Mirror, which reaches almost 500,000 households and more than eleven million people online every day, was the only major national newspaper excluded from the trip.
The Tories had blamed the Mirror’s critical coverage of the Prime Minister in recent weeks.
This has included front page stories on the state of the NHS and criticising the Mr Johnson over his response to flooding in the north of England.
Other stories have shone a light on the dangers of a Brexit deal with Donald Trump opening up the NHS to big pharma, with US firms lining up to cash in.
Two buses bearing the logo “Get Brexit Done” are touring the country as part of the Tory campaign.
The buses then travelled on to Teesside where the PM was met with tough questions from factory workers, a smattering of supporters and protesters shouting “stop lying Boris”.
Mr Johnson met workers at Wilton Engineering including one who challenged him on his tax plans.
The Mirror has been invited onto election ‘battle buses’ under every Tory leader since they were invented in the 1970s, including Mr Johnson’s immediate predecessors Theresa May and David Cameron.
In the days of Margaret Thatcher and John Major, newspapers would buy a ‘campaign ticket’ which guaranteed their seat on the bus for every day on the trail.
Later arrangements meant newspapers boarded the bus by invitation.
But no Tory leader - including William Hague, Mr Cameron and Mrs May - has excluded the Mirror, even when coverage has been critical.
The Mirror was also invited onto Vote Leave’s infamous ‘£350 million a week for the NHS’ bus during the Brexit referendum campaign - led by Mr Johnson and with many of the same aides now running No 10.
Former Tory chairman Norman Tebbit expressed surprise at the decision.
He told the Mirror: “I think if I was running this campaign I would probably want to get my message through to Mirror readers.”
Jodie Ginsberg, Chief Executive of Index on Censorship said: "I think it's appalling.
"Freedom of expression involves supporting and defending the rights of others to say things we don't want to hear.
"That should include political parties accepting journalists whose views they don't share into their spaces.
"It reminds me of how Donald Trump behaves when he tries to eject journalists from White House press conferences because they don't agree with him.
"Conservatives have repeatedly said freedom of expression is a key British value. They should show that by defending it and allowing Mirror journalists onto their their bus."
Daily Mirror editor Alison Phillips said: "Mirror readers have every right to know what the Conservatives have in store for them should Boris Johnson win the election.
"Our journalists have every right to scrutinise the Conservatives on our readers' behalf.
"Blocking us from doing our job is deeply worrying for freedom of journalism and the protection of the truth."
It came as the party were accused of misleading the public on social media for a second time in the election campaign.
During Tuesday night’s live TV debate between Jeremy Corbyn and Mr Johnson, the Tory press office altered its Twitter account to look like an independent fact checking service.
Their name changed to ‘factcheckUK’ for the duration of the ITV debate and the Conservative Party logo was removed from the page.
The move prompted a furious backlash - with the CCHQ account resorting to retweeting jokes about itself in a bid to laugh off the PR disaster.
Hundreds of furious users on social media reported the account to Twitter and the social media giant issued a warning to the Conservative Party for 'misleading' the public.
This morning Twitter warned that any further attempts to "mislead people" during the UK election will result in action.
But they faced calls to immediately suspend the Conservative account in line with their terms of service.
The @CCHQpress account is verified by Twitter, displaying a blue tick which is intended to denote that a user is genuine.
Soon after their 'rebrand', dozens of high-profile Twitter accounts soon copied the move to pillory the Tories, including Royle Family actor Ralf Little.
He changed his name to 'Conservative Press Orifice' and the description to 'Not a fact checker. Or the Conservative Press Office'.
But Mr Little found himself locked out of his account, apparently due to the name-change joke.
He said: “Assume I’ve been suspended. Which is fine. But only if the @CCHQPress account is suspended for the same thing.”
A Twitter spokeswoman said: “Twitter is committed to facilitating healthy debate throughout the UK general election . We have global rules in place that prohibit behaviour that can mislead people, including those with verified accounts.
"Any further attempts to mislead people by editing verified profile information - in a manner seen during the UK Election Debate - will result in decisive corrective action."
Independent factcheckers FullFact hit back: “It is inappropriate and misleading for the Conservative press office to rename their twitter account ‘factcheckUK’ during this debate. Please do not mistake it for an independent fact checking service such as @FullFact, @FactCheck or @FactCheckNI”.
On the first day of the campaign, Tory press officers pushed out a fake news video of an interview with Labour's Sir Keir Starmer, edited to appear he was unclear on the party's Brexit policy.
In a doctored video, which was viewed more than 200,000 times on Twitter , the party inserted several seconds of Sir Keir's face in silence after a question from Good Morning Britain host Piers Morgan.
In reality, Sir Kier had answered the question immediately.
