Republican insiders watching President Donald Trump’s grip on power slip ahead of the midterms have started to use burner phones while it’s believed that some staffers are wagering on prediction markets, according to a report.

Polymarket, an online prediction market platform, has suggested as of Tuesday that Democrats have an 84 percent chance of taking control of the House and 51 percent chance of winning back the Senate, The i Paper reported. Democrats need three House seats and four Senate seats to flip Congress to blue.

Trump’s dropping approval rating and the Iran war have left Republicans increasingly concerned about November.