In marked contrast to his brother, who remains firm that leaving the European Union without a deal would be no bad thing, and resigned because he believed the deal being negotiated was too soft, Mr. Jo Johnson called for a second referendum.
A Cabinet minister said the plan has been developed to ensure the worst elements of a no-deal Brexit could be eased, but they also pointed out it could be beneficial to the United Kingdom in the long run.
"We will be, instead of being in Europe but not run by Europe, we will be out of Europe and yet wholly subject to European rules".
We may not have agreed about Brexit but we are united in dismay at the intellectually and politically indefensible of the UK position.
Mrs May has also come under fire from her own MPs and Cabinet ministers, who have demanded legal advice on the final terms of the UK's exit to ensure the EU can not keep Britain inside the customs union indefinitely.
Transport minister Jo Johnson dropped his bombshell news in a recorded video message released this afternoon.
Asked if his brother Boris Johnson had lied to voters during the referendum about Brexit, the former transport minister said: "In the campaign there were undoubtedly promises made that have shown to be undeliverable".
The MP for Orpington revealed in an open letter he would vote against the withdrawal agreement in the Commons.
Dwyane Wade and Gabrielle Union announce birth of 'miracle baby' daughter
Union also shared her diagnosis of adenomyosis while speaking at the BlogHer conference on August 8, 2018. Many congratulations to Union and Wade-and we can't wait to find out what the couple named their miracle.
The Northern Irish DUP - who May relies on for her parliamentary majority - has criticised the government's proposed plan, saying it could allow Northern Ireland to be separated from the UK.
He said: "To present the nation with a choice between two deeply unattractive outcomes, vassalage and chaos, is a failure of British statecraft on a scale unseen since the Suez crisis".
The deal being negotiated with Europe by the government - dubbed the "Chequers Deal" - would leave Britain economically weakened with no say in European Union rules it would have to adhere to for years, while a "no deal" scenario would inflict damage on the country.
"And, if they can't, because they believe it's a bad deal for the country, then, honourably, they would have to resign".
Jo is not a major figure in the Prime Minister's Cabinet, but it will be perceived as a major blow for her crunch Brexit talks.
"Theresa May is in office, but not in power".
Stormont's former first minister insisted there were "many others" in the Conservative Party who could also not support the Prime Minister's proposals. "He has resigned on an issue of principle putting the country before his party and his own career".