Michael Cohen and Stormy Daniels
Getty Images
Michael Cohen and Stormy Daniels
Now playing
01:55
Stormy Daniels sues Cohen for defamation
Trump Stormy Daniels not changed story new_00000000.jpg
Trump Stormy Daniels not changed story new_00000000.jpg
Now playing
00:54
Trump gets testy with reporter over porn star
ABC
Now playing
02:51
Stormy Daniels releases sketch
Photo Illustration: Getty/Shutterstock/CNNMoney
Now playing
03:39
Stormy, Cohen and Trump: What you should know
rudy giuliani tel aviv
Globes
rudy giuliani tel aviv
Now playing
01:00
Giuliani: Melania believes Trump over Daniels
CBS/"60 Minutes"
Now playing
03:06
Stormy Daniels: 'I have no reason to lie'
NBC/Broadway Video
Now playing
01:11
Stormy Daniels taunts Trump on 'SNL'
playboy karen mcdougal trump amorio maestra preescolar playmate acuerdo ami digital pkg_00000511.jpg
Karen McDougal / Getty Images
playboy karen mcdougal trump amorio maestra preescolar playmate acuerdo ami digital pkg_00000511.jpg
Now playing
01:20
Karen McDougal: Preschool teacher turned Playboy model
trump time magazine cover
CNN
trump time magazine cover
Now playing
01:52
TIME cover shows Trump in 'Stormy' conditions
photo illustration/cbs/getty images
Now playing
05:07
NYT: FBI searched for porn star, playmate payment records
CNN
Now playing
02:51
The cases that bind Cohen, Davidson
Now playing
01:45
McDougal appears in photo with Trump family
Pool
Now playing
00:49
Trump: No knowledge of Stormy Daniels payment
MIAMI BEACH, FL - FEBRUARY 06: Karen McDougal attends Playboy's Super Saturday Night Party at Sagamore Hotel on February 6, 2010 in Miami Beach, Florida. (Photo by Dimitrios Kambouris/Getty Images for Playboy)
Getty Images
MIAMI BEACH, FL - FEBRUARY 06: Karen McDougal attends Playboy's Super Saturday Night Party at Sagamore Hotel on February 6, 2010 in Miami Beach, Florida. (Photo by Dimitrios Kambouris/Getty Images for Playboy)
Now playing
02:53
Karen McDougal and the 'catch and kill' system
Stormy Daniels taking a polygraph exam in 2011.
Courtesy Michael Avenatti
Stormy Daniels taking a polygraph exam in 2011.
Now playing
02:58
Polygraph: Stormy Daniels truthful about Trump
LAS VEGAS, NV - FEBRUARY 04:  Adult film actress/director Stormy Daniels hosts a Super Bowl party at Sapphire Las Vegas Gentlemen's Club on February 4, 2018 in Las Vegas, Nevada.  (Photo by Ethan Miller/Getty Images)
Ethan Miller/Getty Images
LAS VEGAS, NV - FEBRUARY 04: Adult film actress/director Stormy Daniels hosts a Super Bowl party at Sapphire Las Vegas Gentlemen's Club on February 4, 2018 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
Now playing
01:58
The president and the porn star
(CNN) —  

Porn star Stormy Daniels filed a lawsuit for defamation on Monday against President Donald Trump’s personal attorney Michael Cohen.

The suit, filed by her lawyer Michael Avenatti in California, came a day after CBS aired a tell-all interview with Daniels regarding an affair she alleges she had with Trump more than a decade ago, and which the White House continues to deny.

Monday’s legal maneuver is an additional move in an ongoing suit by Daniels against Cohen, Trump and the limited liability company Cohen has said he established to facilitate a payment to Daniels ahead of the presidential election.

Cohen has denied Daniels’ claims but admitted to making the payment. The additional claim that Daniels filed Monday states that Cohen’s denial is a defamatory statement.

“It was reasonably understood Mr. Cohen meant to convey that Ms. (Stephanie) Clifford is a liar,” the complaint reads, referencing Daniels’ real name.

Avenatti added, “Mr. Cohen made the statement knowing it was false or had serious doubts about the truth of the statements.”

Reacting to the latest development, CNN legal analyst Jeffrey Toobin said it is another attempt to compel Cohen, or perhaps even the President, into a deposition under oath.

Toobin said key questions would include whether Cohen actually used his own money to pay Daniels and whether Trump knew about it.

“Those are, I think, the key political issues here, and filing this lawsuit gives Avenatti another opportunity perhaps to get Cohen and perhaps Trump under oath,” he said.

Daniels’ story came to light in a Wall Street Journal article earlier this year, and the ensuing attention has prompted legal complaints and a whirlwind of questions for Daniels, a porn star who alleges she had sex with Trump and signed a nondisclosure agreement in exchange for the payment from Cohen.

Lawyers for Cohen and Trump have fought back against Daniels and Avenatti in turn, and Cohen in an article published last week quipped about taking “an extended vacation” with the money he anticipates getting from Daniels in court over what he says are violations of the nondisclosure agreement.

In the interview that aired Sunday, Daniels said she was threatened in 2011 to keep quiet about the alleged affair, and in a letter obtained by CNN, the law firm representing Cohen alleged its client had been defamed during Daniels’ interview.

New details in amended suit

Monday’s filing included several new claims about why Avenatti is arguing the nondisclosure agreement should be considered invalid.

Avenatti writes the agreement should be ruled “invalid, unenforceable and/or void under the doctrine of unconscionability,” referring to the $1 million punishment per violation of the NDA. Avenatti argues that figure is a random number and is only “intended to inflict a penalty designed to intimidate and financially cripple” his client.

Cohen violated the NDA when he disclosed details of the agreement to The Wall Street Journal, and it should therefore be considered invalid, Avenatti alleges.

He also asserts that the payment was a violation of campaign finance law because it was designed to suppress speech “on a matter of public concern about a candidate for President.”

Avenatti demanded a trial by jury in this case, which is typical of a lawsuit, but was not included in the initial complaint. The suit added several reasons why the arbitration clause of the original agreement is void and argued a court should rule arbitration is not valid.

CNN’s Eric Brander and Maegan Vazquez contributed to this report.