Iraqi officials say President Jalal Talabani is to travel to Tehran Monday to meet with Iranian President Mahmoud Ahmadinejad.
The talks are expected to focus on the deteriorating security situation in Iraq and how Iran can help stem sectarian violence.
Iran is said to have influence with Shi'ite factions and militias in Iraq.
The New York Times newspaper says a bi-partisan panel studying U.S. strategic options in Iraq is expected to urge the Bush administration to undertake aggressive regional diplomacy, including direct talks with Iran and Syria.
The Times quoted officials familiar with the plan as saying the panel will not recommend a specific timetable for a military withdrawal.
Iraq's Prime Minister Nouri al-Maliki urged rival factions of his government to unite to prevent more sectarian violence, which killed a number of Iraqi across the country Sunday.
Mr. Maliki said public disputes among Iraq's politicians are fueling the bloodshed.
Mr. Bush will stop first in Estonia on his way to a NATO summit Tuesday and Wednesday in Latvia, where alliance leaders will discuss Afghanistan.
From there, the president travels to Amman, Jordan, for talks with Iraqi Prime Minister Nouri al-Maliki.
King Abdullah of Jordan, who will host the talks, warned in an interview on American television Sunday that strong action is needed to prevent further deterioration of trouble spots in the Middle East.
He said there are three potential civil wars in the region - the Palestinians, Lebanon and Iraq - and that the Palestinian issue is at the core of all those conflicts.
Some information for this report provided by AP, AFP and Reuters.
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