American prediction market Kalshi has opened an investigation following a series of suspicious trades on its platform related to the selection of the new White House spokesperson, according to a report in The Wall Street Journal. The company is examining a sequence of trades predicting that U.S. President Donald Trump would choose Katie Zacharia for the position, who was not considered a leading candidate and had odds of only about 1% on Kalshi. Before Trump's announcement of her selection, at least three small but well-timed bets were placed, in which the bettors stood to gain thousands of dollars. One bet is expected to yield $1,896, and two others are expected to yield $3,689 and $4,023.