His inclusion in the US delegation is a sign of the influence wielded by Jared Kushner, a 36-year-old with no prior government experience who has become one of the most powerful men in Washington by virtue of his family connection to Trump.
Kushner -- whose wife Ivanka also plays a key role in advising her father -- accompanied General Joseph Dunford, the chairman of the Joint Chiefs of Staff, on a visit to Baghdad before heading to Arbil, the capital of Iraq's autonomous Kurdish region.
As in the Trump administration, family ties can translate into senior posts in Iraqi Kurdish government: Nechirvan is Massud's nephew, while the Kurdish chief's sons Masrour and Mansour play leading roles in the region's security forces.
Kushner and White House homeland security adviser Tom Bossert were travelling with Dunford at the general's invitation, according to US Navy Captain Greg Hicks.
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The day before, Dunford and Kushner met with Prime Minister Haider al-Abadi and Defence Minister Irfan al-Hayali in Baghdad to discuss the war against the Islamic State jihadist group.
The grinding battle for west Mosul has taken a heavy toll on civilians, killing and wounding hundreds and pushing more than 200,000 to flee their homes.
The United States is leading an international coalition that is carrying out air strikes against IS and providing other support to forces fighting the jihadists in both Iraq and Syria.