Donald Trump Jr. announced Monday he is joining Kalshi, a prediction market that allows users to bet on political developments, as a strategic adviser.

“On Election night at Mar-a-Lago, while biased outlets called the race a coin toss, my family and close friends used the prediction market @Kalshi to know we won hours ahead of the fake news media,” Trump Jr. wrote in a post on X.

Trump Jr. advises his father, President-elect Trump, and is influential within the MAGA movement.

“I immediately knew I had to contribute to their mission. Today, I am proud to announce that I am joining Kalshi as a strategic advisor,” Trump Jr. posted, quipping that it was time to bet on “whether Biden is going to pardon Fauci and Liz Cheney.”

Kalshi was at the center of a legal fight earlier this year as courts weighed whether to allow betting on the 2024 federal elections. A federal appeals court in October declined to block a lower court’s decision allowing Kalshi to offer betting markets on federal elections.

The Commodity Futures Trading Commission (CFTC) had asked the appeals court to block Kalshi from allowing buyers to bet on which political party will control the House and the Senate after the upcoming election, arguing it undermined election integrity.

On Monday, Kalshi offered bettors the opportunity to wager on how many executive orders Trump might issue on his first day in office, whether President Biden would issue preemptive pardons, or how many senators would vote to confirm Tulsi Gabbard as director of national intelligence.