British Foreign Secretary Boris Johnson has fueled speculation that he hopes to eventually succeed Prime Minister Theresa May by spelling out his Brexit goals days before her major policy speech on the topic.
Mr Green insisted Mrs May was the "driver" in the negotiations.
The Home Secretary said she did not think Mr Johnson's article was a leadership bid and said her Cabinet colleague added "enthusiasm, energy, and sometimes entertainment".
Unidentified lawmakers within May's Conservative Party were cited by newspapers, including the Mail on Sunday and the Observer, as demanding Johnson's ouster for a move seen as a bid to replace her. Ruth Davidson, the party's Scotland leader, tweeted that "on the day of a terror attack where Britons were maimed, just hours after the threat level is raised, our only thoughts should be on service".
"Both the United Kingdom and the EU would benefit from ensuring that no operational gaps are created" by Brexit, the statement from the Department for Exiting the European Union in London said.
The blueprint differs from the one set out by other Cabinet ministers, including the chancellor, who have stressed the need to remain close to the single market and potentially pay for access.
"This country will succeed in our new national enterprise, and will succeed mightily", he wrote.
Johnson said Brexit is Britain's chance to catch the wave of new technology, and to put the country in the lead as a "tech powerhouse" as one of four big tech investment areas of the world.
Rudd said that while Johnson's article was "backseat driving" over Brexit, it was "absolutely fine" for him to intervene.
"We already have a deep level of collaboration with the European Union on security matters and it is in both our interests to find ways to maintain it", Brexit Secretary David Davis said in a statement.
"Once we have settled our accounts, we will take back control of roughly £350 million per week", he wrote in Saturday's (16 September) edition. The holder of Foreign affairs does not even mention possibility of a transitional period after Brexit, that will surely be storyline of Theresa May in a speech in Florence. "They Brexit isn't going to happen, "who think we are going to bottle it", he added.
May's authority was weakened after she called a snap election in June, only to lose her Conservative party's majority in the House of Commons.
Vote Leave emblazoned the figure on its campaign bus and said the money could be used to fund extra spending on public services such as the NHS.