United Kingdom, Oct. 1 -- Kim Kardashian and Kris Jenner are suing Ray J for defamation.

The Kardashians stars have accused the 44-year-old singer - who was infamously Kim's partner in her 2007 sex tape - of waging a decades-long campaign against them and are taking action following his recent repeated claims that they are the subject of a federal criminal investigation into racketeering.

According to TMZ, the pair's lawyer, Alex Spiro, alleged Ray is "unable to accept the end of his fleeting relationship with Ms. Kardashian over 20 years ago."

The lawsuit specifically mentions comments Ray made in TMZ's Tubi documentary United States Vs. Sean Combs, in which he said: "If you told me the Kardashians was being charged for racketeering, ...