Dozens of staffers' forms listing their salaries, assets and liabilities are now available online.
Legally required disclosures showed the net worth of staffers upon entering the White House, with numerous multi-millionaires.
The White House said Kushner would voluntarily meet with the committee investigating Russian influence on the U.S. election.
The move comes just days after Trump suffered his first major political setback since taking office in January.
The newly elected president is chummy among the club members, joking about inviting them along on Cabinet interviews.
After retailers pulled the Ivanka Trump brand from shelves, the president took to Twitter to condemn them.
New U.S. President Trump says his son-in-law Kushner, 36, is capable of brokering the "ultimate deal" to deliver peace between Israelis and Palestinians.
The private server was implicated when the George W. Bush White House "lost" 22 million emails.
Department of Justice says Ivanka's husband can serve as a White House advisor without breaking federal anti-nepotism laws.
Why not make China, Canada and other countries pay too?
The appointment of Kushner, first reported by NBC, had been anticipated but it had been unclear what his official role would be.
The meeting comes after Trump said Nigel Farage should be U.K. ambassador to the U.S.
The former British prime minister dined with Trump's son-in-law Jared Kushner this week.
Kushner, a real estate investor and newspaper owner, is married to Trump's daughter Ivanka.