In a defiant performance at the despatch box, the Housing Secretary accused his Labour and SNP tormentors of "wild accusations" and "baseless innuendo".
Of course, he said confidently, he would happily outline the timeline of events leading up to his approval of Richard Desmond's £1.5bn scheme and the rationale for his decision-making.
He would also release all the relevant information as well as discussions and correspondence the government would not normally release, he said. In fact, though, he had no alternative.
But when he did publish a nine-page letter justifying his actions, the accompanying texts and emails between Mr Jenrick and Mr Desmond did not make pretty reading for the increasingly beleaguered minister.
The texts between the 38-year-old cabinet minister previously seen as a rising star in Boris Johnson's government and the brash, controversial former Express Newspapers owner were embarrassingly chummy.
The pair had attended a Tory dinner - the first time he had met Mr Desmond, he said in his letter to MPs - on 18 November last year and they exchanged phone numbers. That was probably his first mistake.
His second, almost certainly, was to text Mr Desmond later that evening in gushing tones, saying: "Good to spend time with you tonight, Richard. See you again soon, I hope."
When Mr Desmond replied saying he would call his office the next day to arrange a site visit, Mr Jenrick texted back: "I'd like that. See you soon." He'd like that? Really?
A secretary of state for housing promising a developer a site visit sounds highly irregular. And, to be fair, Mr Jenrick appears to have realised this later and told Mr Desmond it was not appropriate.
But the emails between civil servants suggesting Mr Jenrick wanted to rush a decision don't look good either. And it's these that are potentially most dangerous for him as he battles to survive the political storm.
Mr Desmond wanted a swift ruling to save himself millions of pounds in payments to Tower Hamlets councillors, whom he brands "Marxists". But then the outspoken Mr Desmond has never been shy of voicing his opinions.
"On timing, my understanding is that the SOS is/was insistent that decision issued this week ie tomorrow - as next week the viability of the scheme is impacted by a change in the London regime," wrote one official to another.
So these documents released by Mr Jenrick have raised more questions than they answer. And despite the cabinet secretary Sir Mark Sedwill declaring in a letter to Labour's shadow housing secretary Steve Reed that the prime minister "considers the matter is closed", it isn't, by any means.
This row isn't about a blunder by a civil servant or civil servants inside a cabinet minister's department, like the Windrush deportations scandal that saw Amber Rudd forced to resign as home secretary.
This Is about the personal conduct of a minister in his dealings with a powerful business tycoon and former high-profile media mogul.
And as well as looking bad for Mr Jenrick, the published texts and emails reveal a naivety by the man who is the youngest member of the cabinet and has enjoyed speedy promotion under Boris Johnson. It's difficult to imagine a more seasoned cabinet minister being so pally with a controversial figure like Mr Desmond.
It's not as if the former Express owner is a relatively unknown figure in business. Anyone who has done business with him will testify that he is ruthless, and often unconventional in his determination to get what he wants.
So giving such a firebrand entrepreneur his mobile phone number and then engaging in a lengthy dialogue with him by text was unwise.
The pushy Mr Desmond, who showed the minister a video of his proposed development during the Tory dinner when they first met, was always likely to pursue him relentlessly over the planning application. As his later - increasingly impatient - texts confirm that he did.
Even though Mr Jenrick had no choice but to make public all the correspondence, emails and texts, if he thought it would help, he was sadly mistaken. Naive, even, again.
Although the PM will fight to keep him, this row isn't over. And the heat is on Mr Jenrick now much more than it was during his surprisingly bullish performance in the Commons.