While Trump and Kushner had a private domain name-giving them a personalized dot-com email address-they reportedly did not maintain their own server hardware to physically store the emails sent to it.
"We need those documents to ensure that Ivanka Trump, Jared Kushner, and other officials are complying with federal records laws and there is a complete record of the activities of this Administration".
Ivanka Trump's use of private email for government business bears some similarity to one of President Trump's most prominent and enduring attacks on his 2016 opponent, Democrat Hillary Clinton, for her use of a private email server housed in her NY home while she was secretary of state from 2009 to 2013.
Like Hillary, Ivanka at one point used a personal email account for official communication - but that's where the resemblance begins and ends.
Mirijanian's statement implies that Ivanka Trump did not know better, despite her father constantly criticizing "Crooked Hillary" on the campaign trail for using a private email account as secretary of state.
However, Mr Mirijanian believes there are differences between the cases involving Ms Trump and Mrs Clinton, as the President's daughter did not have a server in her home or office.More news: Money matters: Big day for RBI, Centre ties
"If anybody was on notice not to use private e-mail, it was someone in the Trump White House, particularly someone named Trump".
The story of the first daughter's email use was broken by the Washington Post's Carol Leonnig.
The spokesman claimed that none of Ivanka's emails contained classified information, adding that although she received an official email account, she did not recieve "the same guidance" other government employees received after assuming a government role.
One senior federal official aware of the situation described Trump as the "worst offender in the White House".
Both Clinton and Trump used personal lawyers to scan their emails for classified information.
Numerous messages were allegedly sent in violation of federal records rules, the Post reported, and were uncovered by White House officials reviewing Ivanka Trump's emails in response to a public records lawsuit.More news: Why is it called Black Friday?
First daughter Ivanka Trump, who also serves as a top White House adviser, has been accused of sending hundreds of emails about government business from a personal email account a year ago. Newsweek, that same month, reported specifically on Ms. Trump's e-mail use, saying that it was mostly before she formally joined the administration, and that she "occasionally" did so after she was sworn in as a senior adviser.
New revelations about the extent of Ivanka Trump's personal email use in the White House will be under scrutiny from House Democrats when they take power in January.
But American Oversight called her personal email use a "blatant derogation of the law".
"The president's family is not above the law, and there are serious questions that Congress should immediately investigate", Austin Evers, the group's executive director, said in a statement. The White House, though, never handed over the information requested.
The letter says that the "parallels between Ms. Trump's conduct and that of Secretary Clinton are inescapable" and that an investigation is required to determine if materials have been adequately collected, whether there were cybersecurity breaches, and whether any classified materials are involved or rules were broken. Yet his daughter has been using a private e-mail for government work as well.More news: Nigel Dodds: Northern Ireland has been ‘sold out’ by Theresa May