TEHRAN, Young Journalists Club(YJC)-Abdul-Mahdi made the remarks during an extraordinary parliamentary session in the capital which led to the adoption of a law demanding the withdrawal of US forces from the country on Sunday, the National Iraqi News Agency reported.
The premier said that he was due to meet Soleimani at 8:30 am local time on Friday before the US assassinated the general a few hours earlier.
The revelations come as Baghdad has been mediating talks between Tehran and Riyadh following a recent uptick of tensions the region.
Sunday's parliamentary vote was held in response to Washington's Friday airstrikes targeting Soleimani and his comrades.
Abu Mahdi al-Muhandis, the second-in-command of Iraq's Popular Mobilization Units (PMU) was also killed in the attack.
Iran's judiciary has said that the attack took place despite Soleimani being a "formal" and "high profile" guest of the Iraqi government.