Britain's former leader Boris Johnson announced on Tuesday he would be attending the upcoming U.N. Climate Change Conference, also known as COP27, in a move that could prompt new Prime Minister Rishi Sunak to change his mind and attend the gathering in Egypt.

Johnson told Sky News in his first interview since stepping down as prime minister in September that he had been "invited by the Egyptians" to the COP27 summit in Sharm el-Sheikh.

He said he was "very happy to go" as he had "a particular interest," having hosted last year's event in the Scottish city of Glasgow.

He called the meeting to limit global emissions a "fantastic global success" that did "a huge amount of good for the planet."

Johnson pushed for a greener economy during his tenure in Downing Street until he was forced to quit after a series of scandals.

Sunak, who was appointed prime minister on Oct. 25, has been condemned for announcing that he will not be at the summit at the Egyptian Red Sea resort.

He was also criticized for downgrading the post of the government's COP26 minister Alok Sharma and climate minister Graham Stuart, preventing them from attending cabinet.

Sunak's spokesperson on Oct. 27 cited the prime minister's "pressing domestic commitments" linked to the disastrous economic plans of Johnson's short-lived immediate successor Liz Truss.

But on Tuesday his spokesperson said his attendance was "under review."

Johnson's confirmation that he will be there could persuade Sunak to change his mind, given the reported bad blood between the pair.

As finance minister, Sunak was among the first of Johnson's cabinet colleagues to resign in protest at his leadership, triggering a raft of others in government to quit.

King Charles III, a longstanding advocate for the environment since his days as heir to the throne, will not attend COP27 but will host a pre-conference reception at Buckingham Palace on Friday.