WASHINGTON (CNN) -- The "vast right-wing conspiracy" that attacked him during his presidency has been weakened, but continues to operate against President Obama, former President Clinton said Sunday.

On NBC's "Meet the Press," Clinton was asked about the term his wife Hillary Clinton, now secretary of state, famously coined. "Is it still there?" host David Gregory asked.

"Oh, you bet. Sure it is. It's not as strong as it was, because America's changed demographically, but it's as virulent as it was," the former president replied.

"I mean, they're saying things about him [Obama] -- you know, it's like when they accused me of murder and all that stuff they did," Clinton said, in an apparent reference to conspiracy theories surrounding the suicide of White House deputy counsel Vince Foster.