May's office dismissed the document, which was published on Tuesday by the BBC, and said the poor spelling and childish language indicated it did not represent government thinking, though a spokesperson did not explicitly deny the document was genuine.
Less than five months before the UK is due to leave the EU on March 29, a deal is nearly done, but officials have repeatedly cautioned they are still haggling over the Irish border issue.
According to the communications memorandum, headed “Brexit Communications Grid Summary”, May's cabinet was to review the deal on November 6, with Brexit Secretary Dominic Raab announcing decisive progress today.
After a deal was clinched, leaders such as Japan's prime minister would tweet in support. Irish Prime Minister Leo Varadkar's name was spelt incorrectly.
“The big picture is that a deal is close,” said Anand Menon, professor of European politics at King's College.
Like others named in the document as figures who should publicly back the deal, Menon said he had not been contacted about giving choreographed support.
It is unclear whether May can get parliament to support a Brexit deal: About 320 votes are needed to win, but May's 315 Conservative lawmakers are not united behind her plans.
“Historic moment, put your own interests aside, put the country's interests first and back this deal,” the leaked document said.
If May fails to clinch a Brexit deal with the EU, or parliament votes down her deal, then the UK would face leaving the EU without a divorce deal, and thus without a transition period. Reuters