LOS ANGELES (AP) — Jay Leno turned serious on his show to discuss the late-night chaos at NBC, telling viewers that he'd been doubtful about launching a prime-time show but was prevented by NBC from going to another TV network instead.

Leno, in explaining events from his standpoint, also said on Monday that he had told NBC he'd return to the "Tonight" slot only after Conan O'Brien rejected the network's plan to put both men on in late night.

NBC continued negotiations on Monday on an exit deal with O'Brien that would clear the way for Leno to reclaim the 11:35 p.m. EST slot occupied by "Tonight," which he hosted for 17 years before turning it over to O'Brien last spring.

The network is ending its prime-time experiment, "The Jay Leno Show," because of low ratings and affiliate station complaints.

When NBC told him they wanted to end his new show, Leno told viewers on Monday, he asked to be released from his contract.

"`No, you're still a valuable asset to this company,"' he said the network told him. His reply: "How valuable can I be? You fired me twice."

That was a reference to NBC's decision six years ago to ask him to eventually make way for O'Brien to take over "Tonight," which Leno kept atop the ratings until he left.

He and O'Brien have traded increasingly edgy monologue jokes as NBC tries to extricate itself from its scheduling mess, but Leno told viewers his attitude toward his colleague is unchanged.

"Through all of this, Conan O'Brien has been a gentleman. He's a good guy, I have no animosity toward him. This is all business," Leno said. "You know, folks, if you don't get the ratings, they take you off the air."

Neither of them was a ratings winner, he said, either with "The Jay Leno Show" at 10 p.m. EST or O'Brien's "Tonight."

O'Brien did not immediately respond to a request for comment on Monday night.

Leno gave his audience a history lesson, or what alternately might have seemed a skillfully timed effort to repair any damage to Leno's trademark heart-of-gold image before the deal is made official, as soon as yesterday.

In his recitation, Leno opened with an NBC executive telling him in 2004 that he would have to surrender "Tonight" to O'Brien to keep the gangly, redheaded host of "Late Night" from going to a competitor.

"I said, `Well, I've been No. 1 for 12 years.' They said, 'We know that. We don't think you can sustain it,"' Leno recounted the executive telling him. He joked that he asked if he could at least wait until his show fell to No. 2, but agreed to the hand-over plan.

"Don't blame Conan O'Brien. Nice guy, good family guy, great guy. He and I have talked, and not a problem since then," Leno said.

He told NBC he would retire "'just to avoid what happened the last time,"' he recounted with a chuckle.

What's happening now at NBC turned out to be reminiscent of the contest between Leno and David Letterman to win "Tonight" after Johnny Carson's retirement and NBC's similar dithering at the time.

With a plan in place for Leno to leave "Tonight" in May 2009, before his NBC contract ended, he would be prevented from starting at another network for at least a year, Leno said. He asked to be freed but NBC refused, instead suggesting that Leno could do well with a prime-time show that the network acknowledged would get "killed" against first-run episodes of shows like CBS' "CSI" but could get traction against summer reruns.

Leno said he agreed, in part, because it would allow him to keep his staff of about 175 people working. But the network's plan for patience was unravelled by affiliate TV stations, who said his low ratings were sinking their local late newscasts, which the show precedes.

O'Brien had his own ratings woes, which Leno said — pointedly — started in summer before they could be blamed on Leno's poor prime-time performance.

"Tonight" with O'Brien is drawing about half of the roughly five million viewers Leno attracted as its host, although O'Brien has gotten a significant ratings bump since the network flap started.

When NBC suggested a half-hour show, Leno told the network he wasn't crazy about doing it but said OK. He asked if O'Brien would agree to be moved to midnight and was told yes — it was almost guaranteed.

Leno may have been restrained with his comments, but he couldn't resist a hard-edged joke at NBC's expense.

"CBS is now developing a new sitcom about the troubles here at NBC," he said. "It's called `Two Men and a Half-Assed Network."'

O'Brien let loose on his show Monday, too.

"Last night at the Golden Globes, Julia Roberts said that NBC was in the toilet. NBC was upset and toilets were furious," he said.