Hisham al-Hashemi was a well-connected security analyst who appeared regularly on Iraqi television and whose expertise was sought out by government officials, journalists and researchers.
A vote on the war powers resolution could take place as early as Thursday, amid concerns that Trump could embark on open military conflict with Tehran without consulting Congress.
Iran's government faces street protests and harsh criticism from prominent artists, athletes and journalists after it accidentally shot down Ukrainian jetliner.
Qatari Emir Sheikh Tamim bin Hamad Al-Thani held talks with Iran's President Hassan Rouhani in Tehran.
The non-binding resolution was introduced by Democrats after Trump's order to kill an Iranian commander and retaliatory missile strikes by Iran dramatically escalated tensions between the two foes.
Prices of oil jump on concerns that Iran might respond to the killing of its top general Qasem Soleimani by the United States by disrupting global supplies of energy from the Mideast.
Rouhani was speaking by phone to his French counterpart Emmanuel Macron, as Tehran and Washington engaged in an escalating war of words following Iran shooting down a US drone last week.
According to US media reports, the attack crippled computers used to control rocket and missile launches, while a spying group responsible for tracking ships in the Gulf was also targeted.
Tehran warns "the region will be set on fire" if the US fires one bullet towards Iran, as US President Trump says he aborted Iran strikes "to avoid any deaths" but warns Iran could face "obliteration" in the event of a war.
US President Donald Trump says his country was "cocked and loaded" to hit three sites in Iran in response to downing of a US drone but he cancelled the attack after being told 150 people would die.
Iran calls for "positive signals" from P5+1 signatories without which it will continue decelerating on compliance with 2015 nuke deal, President Hassan Rouhani says, a day after Trump said he's ready for talks with Tehran.
Qatari FM Sheikh Mohammed bin Abdulrahman al Thani urges both sides to find a compromise and begin negotiations, warns against imposing US-led "deal of the century" on the Palestinians.
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