Republican House Oversight Committee Chairman James Comer says he requested information from Kalshi and Polymarket on their efforts to prevent insider trading (Justin Papp/CNBC)

Justin Papp / CNBC: Republican House Oversight Committee Chairman James Comer says he requested information from Kalshi and Polymarket on their efforts to prevent insider trading — Rep. James Comer, R-Ky., chair of the House Oversight and Government Reform Committee, announced Friday on CNBC's “Squawk Box” …