The campaign comes as many of Mr Bush's Republicans worry that the rising death toll and price tag from the unpopular war in Iraq may cost them control of the US Senate and House of Representatives in November 7 elections.
"They're not political speeches," Mr Bush insisted in Arkansas, "they're speeches to make it clear that, if we retreat before the job is done, this nation will become even more in jeopardy."
"We have a duty in this country to defeat terrorists. That's why we'll stay on the offence to bring them to just before they hurt us, and that's why we'll work to spread liberty in order to achieve the peace," he said.
The public relations push was to begin within hours with an Iraq-focused speech to a major US veterans group, and was to culminate with a September 19 address to the United Nations.
"The president will put the violence that Americans are seeing on their TV screens and reading in their papers into a larger context,” said Bush spokeswoman Dana Perino.
The US President will make the remarks during a meeting with the veterans of the American Legion in Salt Lake City, Utah.
Mr Bush will acknowledge "unsettling times" in Iraq and Lebanon as well as the alleged British bomb plot and group them in "one single ideological struggle" against extremists.
Leaders to visit
In addition to the speeches, Mr Bush will host leaders of Kuwait, Pakistan and Afghanistan, each visit a high-profile opportunity to hammer home his messages about terrorism and his call to spread democracy in the Muslim world.
The White House has said that Mr Bush would welcome Kuwait's Emir Sheikh Sabah al-Ahmad al-Sabah on September 5.
However the White House has refused to confirm that he has invited Afghan President Hamid Karzai or Pakistan President Pervez Musharraf - whose offices announced the visits earlier this month.
Those visits may have an additional purpose: Mr Bush suggested in an interview with NBC television on Tuesday that the United States was "getting crushed" in the public relations war with extremists for support in the Muslim world.
"In terms of image, of course I worry about American image. We're great at TV, and yet we're getting crushed in the PR front," he said. "We've got to do a harder job."
The effort may also draw strength as the United States marks five years since the September 11, 2001 terrorist attacks that led Bush to declare a global war on terrorism and temporarily sent his popularity soaring.
Mr Bush has said that a key priority of his second term is promoting what he calls "the freedom agenda" -- the goal of which is spreading democracy as an antidote to the resentments he says breed extremism and terrorism.