David Letterman blasted CBS as “lying weasels” over the cancellation of “The Late Show With Stephen Colbert,” disputing the network’s claim that axing it was purely financial. Letterman, who hosted the “Late Show” for 22 years, believes the move to end the show — set for May 21 — was tied to the sale of the network rather than the financial pressures CBS has cited. “He was dumped because the people selling the network to Skydance said, ‘Oh no, there’s not going to be any trouble with that guy,’” Letterman told the New York Times . “‘We’re going to take care of the show. We’re just going to throw that into the deal. When will the ink on the check dry?’ David Letterman has once again blasted CBS over the cancellation of “The Late Show With Stephen Colbert.” CBS via Getty Images “I’m just going to go on record as saying: They’re lying. Let me just add one other thing, Jason,” he added, referring to Times reporter Jason Zinoman.…