A porn star sued President Donald Trump on Tuesday to declare a “hush agreement” over their alleged affair invalid because he never signed it, documents say.

Los Angeles lawyer Michael Avenatti posted on his Twitter account a copy of what appears to be the suit filed on behalf of the porn star who goes by the name Stormy Daniels. Her real name is Stephanie Clifford.

The hush agreement does “not exist, because, among other things, Mr Trump never signed the document with a Superior Court of California stamp", the suit says.

It alleges she had an intimate relationship with Trump from 2006 to 2007, which she sought to reveal after Trump won the Republican Party nomination for president and other women claimed to have had sexual encounters with him.

With help from his lawyer Michael Cohen, Trump then sought to “aggressively… silence Ms Clifford as part of an effort to avoid her telling the truth, thus helping to ensure he won the presidential election,” the document says.

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Cohen prepared a non-disclosure agreement, a copy of which was attached to the lawsuit and which required a $130,000 payment to be wired from a company known as Essential Consultants LLC to Clifford in return for her silence, according to the documents.

Using the pseudonyms Peggy Peterson and David Dennison, Clifford and Trump were to sign the agreement, along with Essential Consultants.

Days before the November 2016 presidential election which Trump won, Clifford put her name to the document, as did Cohen for Essential Consultants, it says.

“Mr. Trump, however, did not sign the agreement, thus rendering it legally null and void and of no consequence,” the document adds.

Trump declined to comment on the issue. The White House has dodged questions about whether allegations of an affair are true, claiming the matter was dealt with during the campaign.

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