The phrase "potential bombshell" refers to something that has the ability to cause a very big and surprising impact or create a lot of trouble or controversy. Full definition
New York «s Sherman dropped a potential bombshell by reporting that, according to his anonymous sources, Megyn Kelly had told Paul, Weiss investigators that Ailes sexually harassed her a decade ago. (fortune.com)
To the extent that contemporary biblical analysis gets a hearing in Christian circles, the Nag Hammadi Library is a potential bombshell. (religion-online.org)
«Manchester United were hit by a potential bombshell ahead of the Champions League final after it was reported that Cristiano Ronaldo's agent has already held talks with Real Madrid about a possible transfer.» (caughtoffside.com)