It is being seen as an attempt to try and set the tone in the run-up to another round of tough negotiations with Brussels over a transition deal.
British Prime Minister Theresa May will make a speech on Brexit in the next three weeks, one of several planned addresses by senior ministers created to set out the country's path to leaving the European Union, British media reported on Sunday.
The Downing Street source said: "Brexit is a defining moment in the history of our nation".
But while other senior figures such as Brexit Secretary David Davis and Cabinet Office minister David Lidlington will also get their own speeches, Chancellor Philip Hammond will not.
"As we move along the road to that future, we will set out more detail so people can see how this new relationship will benefit communities in every part of our country".
The public relations blitz comes after a rocky few weeks for the government in which Cabinet tensions over Brexit have returned to the surface.
Her speech will set out the security relationship Britain wants with the European Union, while others will touch on workers' rights, trade and the devolution of power within Britain, the reports said.
However, while Mr Barnier is tasked with defending the EU's interests, he does appear to have a developing rapport with the Prime Minister and a greater understanding of Mrs May's political difficulties as she presides over a party in which two of the more viciferous backbenchers, Jacob Rees-Mogg and Anna Soubry, could not hold more divergent views. She will deliver another setting out Britain's future partnership, although a date for that has yet to be confirmed.
Foreign secretary Boris Johnson, Brexit secretary David Davis, worldwide trade secretary Liam Fox and cabinet office minister David Lidington are expected to make speeches, according to the BBC, but chancellor Philip Hammond and home secretary Amber Rudd are not.
Brexit Secretary David Davis will discuss business standards, Cabinet Officer minister David Lidington will talk about devolution, while Trade Secretary Liam Fox will detail future global trade deal strategy, No. 10 said.
May's authority on Brexit, already weakened after a failed gamble on a snap election a year ago, has been further damaged by ideological splits between ministers, exacerbating concerns that Brexit talks may fail and the government collapse.
On Friday, an exasperated Michel Barnier, the EU's chief negotiator, said he was mystified by the Government's approach to the negotiations, as he warned a transitional deal "is not a given".
Last week, Japanese businesses warned May that they would have to leave Britain if trade barriers after Brexit made them unprofitable.
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