Baghdad:
US Vice President Joe Biden was on Sunday marking the Independence Day with American troops in Iraq ahead of talks later in the day with the two men vying to lead the conflict-wracked nation's next government.
Biden, on day two of his second trip to Baghdad this year, had said on Saturday he was "extremely optimistic" Iraq's politicians could resolve their differences despite a four-month impasse since a deadlocked general election.
Accompanied on his visit by wife Jill, the vice president was greeting troops at a US military base near Baghdad ahead of meetings with national leaders, including Prime Minister Nuri al-Maliki.
Also on the agenda are talks with Iyad Allawi, a former prime minister who narrowly beat incumbent premier Maliki into second place in the March 7 parliamentary ballot that has yet to usher in a new government.
Allawi, a Shiite, insists as the election's victor that he has the right to become Prime Minister, especially as his Iraqiya coalition had strong backing in Sunni-dominated provinces.
Maliki, however, who is fighting to hold on to his job, has so far managed to stymie Allawi's chances by forming a Shiite super-party that with 159 seats is only four seats short of a majority in the new 325-seat Baghdad parliament.
The failure of either man to bow out to the other has alarmed Washington which is steadily reducing its military presence in the country seven years after the US-led invasion that ousted dictator Saddam Hussein from power.