There has been growing speculation that both Colbert and Jon Stewart, who hosts one broadcast of Comedy Central’s “Daily Show” each week, could be under growing scrutiny from executives at Skydance Media, which is slated to acquire Paramount Global, the parent of both CBS and Comedy Central. David Ellison, who leads Skydance, has projected an image of being intrigued by the politics espoused by President Donald Trump, who Colbert and Stewart routinely skewer in monologues and commentary.