"And replaces Pres Trump at the #G20 table as he leaves for bilateral meetings", Lukash had tweeted around 5:39am ET.
G-20 leaders are allowed to bring staff into the room for some of the meetings, and when other leaders stepped out during today's session, their seats were briefly filled by others.
At the meeting, the president praised Ivanka and told the leaders that she's a "great champion".
Speaking at the launch, President Trump discussed his daughter, in light of her busy schedule at G20, and the criticism she often faces.
Earlier Saturday, Ivanka and Mr. Trump spoke at a World Bank event for a fund supporting women entrepreneurs.
Although the tweet was quickly deleted, it had already been seen and screenshotted by hundreds of furious G20 observers who accused the USA president of a dereliction of duty.
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Trump was spotted sitting in her father's seat at a working session on "Partnership with Africa, Migration and Health" Saturday.
Her appointment in March as an official unpaid advisor to her father's White House adminstration spraked fury and accusations of nepotism.
Although not elected, confirmed, sworn-in, or even holding an official position within the United States government, Ivanka represented the USA at a G20 leaders session on African migration and health.
The creation of the facility was Ivanka Trump's idea as she held meetings on the topic of women's empowerment during the beginning of her father's administration, including one with World Bank President Jim Yong Kim, who shepherded the facility's creation.
"If she weren't my daughter, it would be so much easier for her", Trump said.
Ivanka Trump's involvement in worldwide politics has raised eyebrows. I have to tell you that.
The fund cements the World Bank's ties to the Trump family at a time when President Donald Trump's administration has questioned the wisdom of financing poor countries and emerging markets with US cash.