Donald Trump Jr., the eldest son of US President Donald Trump, is stepping down as a paid adviser to prediction market platform Kalshi, the company announced on Thursday, November 12.
The decision was reached by mutual agreement after his investment firm, 1789 Capital, increased its investment in Polymarket, one of Kalshi's biggest competitors, according to a report by The Guardian.
The announcement comes amid growing political scrutiny following the midterm elections, in which Democrats secured control of both the House of Representatives and the Senate. Democrats have indicated plans to investigate the Trump family's investments and its business relationships with Kalshi and Polymarket.
Kalshi spokesperson Danny Leff said the company had mutually agreed to end Trump Jr.'s advisory role after his investment firm made a substantial investment in a competing platform earlier this summer.
"We mutually ended Don's advisory role after his investment firm made a significant investment in a competing company this summer. We appreciate his contributions to marketing initiatives that helped grow Kalshi's customer base," Leff said.
Trump Jr. was appointed a strategic adviser to Kalshi shortly after his father began his second presidential term in January 2025. He has also been an investor in Polymarket since August 2025.
Both Kalshi and Polymarket have experienced significant growth in popularity and user numbers over the past two years.
The report also noted that both platforms have received support from the White House in various areas. The US Commodity Futures Trading Commission (CFTC) has backed efforts to expand prediction markets, including allowing customers to trade contracts related to sporting events.
However, both companies have strongly denied allegations that financial ties involving Polymarket, Kalshi and the Trump family have influenced regulatory decisions or policymaking under the current administration.
In August this year, 1789 Capital increased its investment in Polymarket as part of the platform's latest fundraising round.
Kalshi said that investment was the primary reason behind discussions that ultimately led to the termination of Trump Jr.'s paid advisory position.