The decision to attend was being matched by dignitaries around the world.
Prince Charles will be there —by a day. He'll be joined by British Prime Minister Tony Blair.
Dozens of heads of state will be present in Rome, prompting authorities to embark on a massive security boost, CBS News Correspondent Sheila MacVicar reports. Already, 10,000 additional police have been brought into Rome from all around Italy. The Italian army is also involved, and intelligence services are on high alert.
In a highly unusual move, Germany will be represented by both Chancellor Gerhard Schroeder and by the country's president. Usually one or the other leader attends official ceremonies abroad.
The office of French President Jacques Chirac issued a statement today saying he and his wife will attend.
And Spanish officials are confirming the royal couple will be among the mourners in Rome. King Juan Carlos and Queen Sofia were close to the pope.
The Spanish delegation will also include Prime Minister Jose Luis Rodriguez Zapatero, whose socialist government has clashed with the Roman Catholic church over same-sex marriage.
President Bush is leaving Washington for Rome on Wednesday, and was to have meetings with foreign leaders Thursday. The president planned to leave Italy immediately after the funeral to spend the weekend at his ranch in Texas.
Mr. Bush said Tuesday that his attendance at the services would "pay our country's respect to a great world leader."
"He shows that one man can make an enormous difference," Mr. Bush said during a Social Security speech in Parkersburg, W. Va. "I look forward to honoring the memory of Pope John Paul II."
Mr. Bush will be the first sitting president to attend a pope's funeral. In 1978, when two popes died, President Jimmy Carter sent his wife Rosalyn and his mother Mrs. Lillian Carter to lead the delegations.
Dignitaries planning to attend Pope John Paul II's funeral:
ALBANIA: President Alfred Moisiu, Prime Minister Fatos Nano.
ARGENTINA: Vice President Daniel Scioli, Foreign Minister Rafael Bielsa.
AUSTRIA: President Heinz Fischer, Chancellor Wolfgang Schuessel, Parliament Speaker Andreas Khol.
BELGIUM: King Albert II, Queen Paola, Prime Minister Guy Verhofstadt.
BRAZIL: President Luiz Inacio Lula da Silva.
BRITAIN: Prince Charles, Prime Minister Tony Blair.
BULGARIA: President Georgi Parvanov.
CANADA: Prime Minister Paul Martin.
CHILE: Foreign Minister Ignacio Walker.
COLOMBIA: Vice President Francisco Santos.
COSTA RICA: President Abel Pacheco.
CZECH REPUBLIC: President Vaclav Klaus, Foreign Minister Cyril Svoboda.
DOMINICAN REPUBLIC: First lady Margarita Cedeno and Ambassador to the Vatican Carlos Rafael Marion-Landais.
EL SALVADOR: First lady Ana Ligia Mixco de Saca, Foreign Minister Francisco Lainez.
ESTONIA: President Arnold Ruutel.
FINLAND: Prime Minister Matti Vanhanen.
FRANCE: President Jacques Chirac and his wife, Bernadette.
GERMANY: Chancellor Gerhard Schroeder, President Horst Koehler.
GUATEMALA: President Oscar Berger and his wife, Foreign Minister Jorge Briz and Nobel Peace Prize winner Rigoberta Menchu.
HAITI: Interim Prime Minister Gerard Latortue.
HUNGARY: President Ferenc Madl, Prime Minister Ferenc Gyurcsany.
INDIA: Vice-president Bhairon Singh Shekhawat.
IRELAND: President Mary McAleese, Prime Minister Bertie Ahern.
LATVIA: President Vaira Vike-Freiberga.
LEBANON: President Emile Lahoud, Prime Minister Omar Karami.
LIECHTENSTEIN: Prince Hans-Adam II, Princess Marie, Prince Nicholas.
LITHUANIA: President Valdas Adamkus.
LUXEMBOURG: Grand Duke Henri and Grand Duchess Maria Teresa, Prime Minister Jean-Claude Juncker.
NICARAGUA: President Enrique Bolanos, Foreign Minister Norman Caldera, Ambassador to the Vatican Armando Luna.
PANAMA: First lady Vivian Fernandez de Torrijos.
POLAND: President Aleksander Kwasniewski and his wife, Prime Minister Marek Belka, former President Lech Walesa.
PORTUGAL: European Commission President Jose Manuel Barroso, President Jorge Sampaio.
ROMANIA: Romanian President Traian Basescu, Prime Minister Calin Popescu Tariceanu.
RUSSIA: Prime Minister Mikhail Fradkov; Metropolitan Kirill, foreign minister for the Russian Orthodox Church.
SERBIA AND MONTENEGRO: Kosovo President Ibrahim Rugova.
SLOVAKIA: President Ivan Gasparovic, Parliament Chairman Pavol Hrusovsky.
SPAIN: Prime Minister Jose Luis Rodriguez Zapatero, King Juan Carlos and Queen Sofia.
SWITZERLAND: President Samuel Schmid.
SYRIA: President Bashar Assad.
UNITED NATIONS: Secretary-General Kofi Annan.
UNITED STATES: President George Bush and his wife, Laura.
URUGUAY: First lady Maria Auxiliadora Delgado de Vazquez.
VENEZUELA: Foreign Relations Minister Ali Rodriguez, Planning Minister Jorge Giordanni.