Rudy Giuliani quits White House race to backs John McCain
Earlier, Democrat John Edwards left the race, without backing any of his rivals, after failing to win a single party nomination contest.
Mr Edwards contested Iowa, New Hampshire, Nevada and his native South Carolina, but only in Iowa did he get higher than third place, and that only by the narrowest of margins.
He told supporters in New Orleans, where he launched his latest White House bid in 2006: "It’s time for me to step aside so that history can blaze its path."
His endorsement could be crucial in the tight race between the two remaining Democratic candidates, Hillary Clinton and Barack Obama.
Mr Giuliani announced his withdrawal just before the remaining Republican candidates began a televised debate at the Reagan Library in Simi Valley, California, on Wednesday.
With the two other candidates - former Arkansas Governor Mike Huckabee and Texas Congressman Ron Paul - often struggling to be heard, the 90-minute debate was dominated by the verbal jousting of the two front-runners.
Former Massachusetts Governor Mitt Romney accused Mr McCain of "dirty tricks" for accusing him - just before Tuesday’s Florida primary - of supporting a date for withdrawing troops from Iraq.
"It’s offensive to me that someone would suggest that I have," said Mr Romney.
Mr Romney said Mr McCain was out of the conservative mainstream, having twice voted against President George W Bush’s tax cuts, which the Republican establishment had embraced.
Mr McCain countered that he was proud of his conservative credentials, and questioned Mr Romney’s administrative record in Massachusetts.
"His job creation was the third worst in the country," said the Arizona senator.
The simmering tensions were indicative of the pressure that is building ahead of next week’s "Super Tuesday", when 24 states hold their nominating votes in what could be a decisive day in the race to succeed Mr Bush.
In contrast to the heated exchanges in Simi Valley, Mr Giuliani’s address was light-hearted.
He said he had thought he was the sort of person who had the qualities to make a good president of the United States, "but the voters made a different choice".
"John McCain is the most qualified candidate to be the next commander in chief of the United States," Mr Giuliani said. "He’s an American hero and America could use heroes in the White House."
He added that Mr McCain was a long-standing friend and that he would campaign alongside him whenever and wherever he was needed.
Mr McCain returned the compliments, praising Mr Giuliani’s leadership as mayor in the wake of the attacks on the US on 11 September 2001.
He described his former rival as "my strong right arm and my partner".
"This man is a national hero and I’m honoured by his friendship," he said.
Mr Giuliani was seen by his supporters as a tough commander-in-chief, while other Republicans were wary of his attitude on social issues like abortion.
When he entered the race more than a year ago, he led some national polls and had an impressive war chest. He is reported to have spent up to a million dollars a week on TV advertising in Florida alone.
Correspondents say his decision to focus his efforts on Florida was always going to be either a stroke of political genius or an unwise gamble that would see him fall at the first hurdle.
Mr Giuliani won 15% of the vote, behind Mr McCain with 36% and Mitt Romney with 31%, and just ahead of Mike Huckabee, who won 13%. /APA/
Americas
Trump: Preventing Iran from developing nuclear weapons is more important than global crisis
Rubio heads to UAE, Kuwait, Bahrain to discuss Iran deal with Gulf allies
US license issues authorization for Iranian oil transactions
Iran must rein in Hezbollah under new deconfliction process, Vance says
NEWS FEED
France will not support lifting sanctions on Iran
Trump: Preventing Iran from developing nuclear weapons is more important than global crisis
Argentina beats Austria, reaches FIFA World Cup knockout stage as Messi shines again
Qatar to help create mechanism to control use of Iran’s frozen assets — Vance
Messi becomes leading goalscorer in World Cup history
Erdoğan welcomes Iran-US agreement in call with Pezeshkian
2 injured in drone attack on Turkish-owned vessel off Ukraine coast
Azerbaijan’s Top Diplomat discussed current situation between the two countries with his Turkmen counterpart
Human skeletal remains discovered in Aghdam
Rubio heads to UAE, Kuwait, Bahrain to discuss Iran deal with Gulf allies
EU vows deeper integration of Moldova before membership
Kazakh President arrives in Brussels on official visit
State banquet hosted on behalf of President Ilham Aliyev in honor of President of Turkmenistan-PHOTO
Council of Europe Baku Office head Petr Zix summoned to Foreign Ministry
Turkmen minister visits DOST Center
Azerbaijani citizens among top five groups of foreigners permanently residing in Georgia
Northern Ireland First Minister accuses Keir Starmer of discrimination
13 killed, 66 injured in gas processing plant explosion in Qatar-UPDATED-1
Azerbaijan, Turkmenistan discuss expanding customs cooperation
President Ilham Aliyev: Relations with Turkmenistan are built on a solid foundation of historical and cultural ties
Georgia to establish unified register of foreigners
Netanyahu says Israel will remain in southern Lebanon as long as necessary
US license issues authorization for Iranian oil transactions
Qatar PM: We have reached the stage of ending the war between the US and Iran
Presidents of Azerbaijan and Turkmenistan delivered press statements-PHOTO - UPDATED
President: We have always supported and will continue to support Turkmenistan’s policy of neutrality
President Ilham Aliyev: Cooperation between Azerbaijan and Turkmenistan in transport and logistics is long-term in nature
Body of third victim recovered from sea in Mardakan, one person still missing-UPDATED-1
Serdar Berdimuhamedov: Cooperation between Turkmenistan and Azerbaijan serves the long-term interests of our countries
At least 14 killed in fire at coaching centre in India's Lucknow
Prime Minister of the Kurdistan Region of Iraq congratulates President Ilham Aliyev on Independence Day and Eid al-Adha
Vietnam's President congratulates Azerbaijani leader on 108th anniversary of Independence Day
Boy killed, 2 children hurt in Philippine mortar explosion
Iran must rein in Hezbollah under new deconfliction process, Vance says
Iran has agreed to invite IAEA inspectors back into country: Vance
Vance: Iran threatened to suspend talks, but dialogue continued until the end
President Ilham Aliyev held expanded meeting with President of Turkmenistan-UPDATED
Azerbaijan's ambassador to Uzbekistan awarded 1st Degree Order “For Service to the Fatherland”
Iran agrees to invite IAEA inspectors back, Vance says
Iranian president expected to visit Pakistan
Sahiba Gafarova meets with Speaker of Jordan's House of Representatives
Peskov: Putin and Lukashenko to discuss Zelenskyy's threats against Belarus
Russian forces shoot down more than 700 Ukrainian drones
UN-Habitat Executive Director thanks President Ilham Aliyev for successful hosting of WUF13
Ukrainian Defense Forces strike satellite communications center in Moscow region
Three injured in Ukrainian strike on Voronezh, governor says - UPDATED
Aircraft flying from Armenia to Moscow issues distress signal and lands in Makhachkala-UPDATED
Iranian Foreign Ministry spokesman confirms start of technical talks with U.S. in Switzerland-UPDATED
Azerbaijan sends another relocation convoy to Jabrayil's Shukurbeyli village, families receive house keys - UPDATED - 1 - PHOTO
Moscow airports temporarily suspend flights amid latest drone attacks-UPDATED