Boris Johnson’s Brexit minister has resigned from the cabinet and will depart in the new year.
Lord Frost quit in a letter to the prime minister last week, but won’t officially leave until January.
Sky News’ deputy political editor Sam Coates said that Lord Frost goes “on good terms”, but he is unhappy with the direction of government – high taxes, the push towards net-zero, and most recently COVID regulations.
As the “architect” of Brexit, Coates said Lord Frost’s departure is set to be “extremely significant” for Mr Johnson, whose primary aim heading into the last election was to “get Brexit done”.
Labour’s shadow Brexit minister, Jenny Chapman, tweeted: “As if we didn’t already know, Lord Frost resigning shows the government’s in chaos.
“The country needs leadership not a lame duck PM whose MPs and cabinet have lost faith in him.
“Boris Johnson needs to apologise to the public and explain what his plan is for the next few weeks.”
The resignation is yet another blow for Downing Street, which has lurched from crisis to crisis in recent weeks, including the Christmas parties scandal.
Sky News understands Lord Frost, 56, is unhappy with the direction the government is taking.
He believes taxes under Mr Johnson are getting too high.
And Lord Frost is also said to opposed to the emphasis placed on the net-zero strategy to reduce carbon emissions.
But the final straw is said to be the re-introduction of COVID regulations due to the spread of the Omicron variant.
Meanwhile, Labour deputy leader, Angela Rayner, said Downing Street was in “total chaos” as the nation faces an “uncertain few weeks”.
She accused Mr Johnson of not being “up to the job”, tweeting: “We deserve better than this buffoonery.”
Liberal Democrat foreign affairs spokesperson Layla Moran criticised Mr Johnson for being “weak” at a time the country is in need of strong leadership.
“This shock resignation is a sign of the chaos and confusion at the heart of this Conservative government,” Ms Moran tweeted.
It comes amid ongoing wrangling over the Northern Ireland Protocol.
Lord Frost has been locked in tense talks with European Commission vice-president Maros Sefcovic as the UK and the EU attempt to close gaps in post-Brexit arrangements.
Northern Ireland’s former first minister Arlene Foster described Lord Frost’s resignation as “enormous”.
She tweeted: “The resignation of Lord Frost from the Cabinet is a big moment for the Government but enormous for those of us who believed he would deliver for NI.”
DUP leader Sir Jeffrey Donaldson MP said Lord Frost’s departure is a bad sign for Mr Johnson’s commitment to removing the Irish Sea border.
Sir Jeffrey said the government was “distracted by internal strife” as he suggested Lord Frost was “frustrated on a number of fronts”.