Susanna Reid interviewed Prime Minister Boris Johnson on the ITV show on Tuesday for the first time since he and other government ministers were accused of boycotting the series during the coronavirus pandemic.
The GMB TV presenter quizzed the PM on everything from Partygate to allegations in the House of Commons of bullying and sexism, as well as the ongoing cost of living crisis.
Susanna raised the possibility of a windfall tax on the energy company profits, saying: "It doesn't help people right now who are paying their energy bills - which have gone up hundreds - to be told we need to leave that money to the energy companies, because they need to invest.
"That's their job. Your job is to help people pay your bills."
The PM replied: "What we're doing is helping people with the cost of energy," but Susanna cut in saying: "You've offered people a loan they have to pay back."
Boris responded: "I accept that those contributions from the taxpayer aren't going to be enough immediately to help cover everybody's cost. Of course that isn't going to be enough immediately to help cover everybody's cost."
Susanna then said: "So you acknowledge you are not doing everything that you can," to which the PM admitted: "There is more that we can do. The crucial thing is to make sure we deal with the prices over the medium and long term."
Susanna then decisively concluded: "When you say you're doing everything we can, you're not being honest are you, because you've just said there's more you can do."
While other ministers have appeared on the show since, Johnson had not been interviewed on the show for almost five years - since he was accused on air of hiding in a fridge to avoid a GMB reporter in 2019.
Johnson sat down with Susanna for his first interview on the ITV daytime series since 2017, according to ITV, and the conversation aired live from Downing Street.
Susanna’s co-star Kate Garraway confirmed the news on Monday's episode, revealing: "Speaking of Boris Johnson, we are actually gonna be hearing from him for once tomorrow.
"Susanna Reid is going to Downing Street and their interview will be live on Good Morning Britain tomorrow from 6am, so we will be able to hear exactly what he has to say."
She added: "It's been 1,790 days, nearly five years, since he last spoke to this show."
Former GMB host Piers Morgan, who was on air during the awkward moment the PM appeared to hide from the cameras back in 2019, since reacted to the news he would finally be on the show.
Piers commented on Twitter : "He’s out of the fridge! If you’re doing the rounds Boris Johnson - you know where to find me."
While Piers was on the show, he and Susanna counted daily how long it had been since Tory ministers and Johnson had been on the show.
When Piers left the show last year, many government ministers and MPs began agreeing to return to the series - having clashed on air with the telly host in the past.
Good Morning Britain airs weekdays at 6am on ITV.