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Boris Johnson has been accused of "weapons grade s***housery" over claims he copied a post by a legal expert on the London Bridge terror attack.

The Secret Barrister wrote an in-depth thread about Usman Khan's sentencing history and the law, debunking many of the claims made by the Prime Minister and Home Secretary Priti Patel.

The anonymous blogger now alleges that the PM has reproduced his or her blog in a series of tweets that Mr Johnson published this morning.

Mr Johnson started off his 16-tweet thread saying that he wanted to address some of the "inaccuracies" reported in the case.

He tweeted: "The terrible Khan case has highlighted a complicated area of law. There have been many inaccuracies reported about this case over the last 24 hours."

But the Secret Barrister was particularly irked because they said they had written their blog in response to "lies" from the Prime Minister.

(Image: PA)

"The Prime Minister has basically copied and pasted my blogpost into a thread and passed it off as his own explanation. A blogpost which I had to write to rebut the lies he spent yesterday spouting," they tweeted.

"This is weapons grade sh**housery."

The expert replied to the Prime Minister (with a reference to his senior adviser Dominic Cummings) and a link to the original blog saying: "Hi Dom! You forgot to credit my blogpost from which this thread was plagiarised. Here you go:"

The legal blogger then pointed to a number of elements in the PM's thread which were the same as the blog.

These include linking to the same Prison Reform Trust document and making the same observation that the comments of Lord Justice Leveson about the involvement of the parole board during Khan's appeal were taken out of context.

But there was also an important difference between the two legal explanations.

The Secret Barrister tweeted: "Worth adding that your 16th tweet is a lie. Under the current law, which has changed a lot since 2008, no terrorists are automatically released early from their sentences. But you know that, being the legal sage you are."

The barrister was moved to write his or her blog after the Prime Minister said: "I have long argued that it is a mistake to let serious and violent criminals out of prison early and it is very important that we get out of that habit and that we enforce the appropriate sentences for dangerous criminals, especially for terrorists that the public want to see.”

The blogger felt the need to point out that "absolutely nothing in his manifesto would have made the slightest difference to the sentence or release in a case like that of Usman Khan".

The Prime Minister repeated a number of his claims this morning telling the Andrew Marr show: "His release was necessary under the law because of the automatic early release scheme under which he was sentenced, that was the reality, and that was brought in by Labour with the support of Jeremy Corbyn and the rest of the Labour Party.

"I opposed it both in 2003 and 2008, and now that I am Prime Minister I'm going to take steps to make sure that people are not released early when they commit... serious sexual, violent or terrorist offences."

A number of Twitter users were quick to cast doubt on whether the Prime Minister had written the detailed legal thread.

Matthew Scott, who also writes a legal blog, posted: "The transformation from ignoramus to leading candidate for the editorship of Current Sentencing Practice happened remarkably quickly. Credit to @BarristerSecret ."

Footballer Gary Neville retweeted the Prime Minister's thread with the comment: "you definitely didn't write this tweet".

Meanwhile Former Chief Prosecutor Nazir Afzal accused both the Prime Minister and Home Secretary Priti Patel of "lying".

He tweeted: "30 years working in criminal justice Half that time at Chief Officer level Having overseen prosecution of perhaps a million cases.

"Worked with dozens of ministers of all parties I have never felt need to say this: This Prime Minister (& Home Secretary) are both lying to us."

Read the original blogpost from the Secret Barrister here .