Labor Day, a US public holiday that falls on the first Monday of September, marks the end of the summer and, in an election year, marks the point when many Americans start to really engage and pay attention to the race for the White House.

The first week of September is traditionally when campaigning steps up a gear ahead of polling day in November.

Despite the pandemic, this year has been no different with Donald Trump and Joe Biden both hitting the campaign trail over the last week.

The start of election season has also brought a raft of new books on the Trump presidency. Most have been negative but not all.

Last Tuesday alone memoirs were released by Donald Trump's former personal lawyer Michael Cohen, former White House Press Secretary Sarah Huckabee Sanders and by former FBI agent Peter Strzok, who led the investigation into Hillary Clinton's emails and allegations of ties between the Trump campaign and Russia.

In his book 'Disloyal: A Memoir', Michael Cohen portrays Donald Trump as a mobster who made racist comments about African-Americans and Hispanics.

Mr Cohen wrote the book while in prison and claims that the US president is "guilty of the same crimes" that landed him behind bars. 

He writes that Donald Trump is a "a cheat, a liar, a fraud, a bully, a racist, a predator, a conman" and someone with the mentality of a "mob boss".

The White House dismissed the book as lies.

"Michael Cohen is a disgraced felon and disbarred lawyer, who lied to Congress," White House Press Secretary Kayleigh McEnany said in a statement.

"He has lost all credibility, and it's unsurprising to see his latest attempt to profit off of lies," she added.

One of Ms McEnany's predecessors in the role of press secretary, Sarah Huckabee Sanders, praised the US president in her book 'Speaking for Myself' which came out on the same day.

"President Trump isn't perfect, he isn’t always easy, but he loves the American people and is willing to fight for them even if that means fighting alone," she wrote.

Someone who Donald Trump has spent years fighting also released a book on Tuesday.

Peter Strzok described the US president as a national security danger, writing that he was compromised, beholden to Russia and vulnerable to pressure from Vladimir Putin.

Mr Strzok was removed from the investigation into links between the Trump Campaign and Russia after the discovery of text messages between him and his colleague Lisa Page criticising Donald Trump.

The US president has repeatedly attacked Strzok describing him as one of the architects of the Russia "witch hunt" against him.

Despite all of the headline-grabbing claims contained in the aforementioned publications, the book that made the biggest news this week hasn't even come out yet.

'Rage' by veteran journalist Bob Woodward will be released on Tuesday and no doubt its publishers are expecting big sales following the drip-drip release of extracts throughout the week.

Mr Woodward carried out 18 interviews with the US president over the course of several months and in one of them, Donald Trump admitted downplaying the threat posed by the coronavirus.

He also acknowledged the seriousness of the virus in the taped conversations while delivering a very different message in public.

The revelations led to a storm of controversy and the US president resorted to his usual tactics of dismissing negative press as fake news and political hit jobs from the mainstream media.

The problem with that defence however is that, this time, the claims are not coming from anonymous White House sources or disgruntled ex-employees. The controversy has been generated by the president's own words which are on tape.

It begs the question as to why Donald Trump decided to give Bob Woodward so much access and to allow the interviews be recorded.

Despite constantly criticising the media, the US president cares a great deal about how he is portrayed in the press.

Bob Woodward, who broke the story of the Watergate scandal along with Carl Bernstein, is one of the US's most respected and best-known journalists.

In 2018 he wrote a scathing best-seller about Donald Trump called 'Fear'.

This time around, the US president wanted to try to shape the narrative and work with, rather than against, Bob Woodward but his efforts appear to have backfired with days of negative headlines emanating from a book that has not yet even hit the shelves.

The revelations in 'Rage', and other books, won't damage Donald Trump among his rock-solid support base but that isn't enough for him to retain the White House.

To close the gap in the opinion polls he needs to attract undecided voters in swing states like he did in 2016. Controversies and scandals will not help that effort.

There will no doubt be plenty of other surprises over the coming weeks in a campaign that has already had all the drama of a tell-all memoir.

In this case the final chapter won't be written until the election results are known.