The material says that they do not plan to quietly resign from politics or "make life easier for their successor."
It is noted that Truss this weekend, for the first time since leaving the premiership, will make material in which he will call for tax cuts.
Johnson, according to the publication, "has not given up hope" of a return to politics.
On October 20, Truss announced her resignation.
On October 25, Sunak took office as Prime Minister of Great Britain, having received a mandate to form a government from Charles III.