Jenrick and Reform UK have had some fairly salty exchanges in the past. Given they have, at least until now, been political opponents, that’s perhaps not a surprise.
Yet it is still a significant hiccup they would have to explain if he were to defect.
For example in August, Nigel Farage posted on X: “Jenrick is a fraud.”
And when it comes to Zia Yusuf, Reform’s head of policy and former chairman, it is hard to choose the best example of him attacking Jenrick and his record.
It is also worth reflecting on what a political journey Jenrick has been on for his defection even to be plausible.
He was first elected in a by-election in 2014 where his main rival was Farage’s then-party, Ukip.
Once in the Commons, he was part of the Conservative mainstream, voting Remain in the EU referendum and backing first Michael Gove then Theresa May in the leadership election that followed.
When he joined forces with Rishi Sunak and Oliver Dowden to endorse Boris Johnson’s 2019 leadership campaign it was a massive moment because it signalled that that was where the momentum of mainstream Conservative rising stars was flowing.
Jenrick got by far the biggest job of the trio – housing secretary – in Johnson’s first cabinet but before long was left far behind by his closest political friends.
When Sunak became prime minister, it was striking that Jenrick was not even a full cabinet minister as immigration minister.
It was his experience in this job which, friends say, transformed him as he saw up close what he saw as a dysfunctional immigration system. His internal critics claimed that this was political opportunism from somebody anticipating a post-general election leadership contest.
Ultimately, he quit Sunak’s government because he believed his policies on illegal immigration did not go far enough. And he moved to the right on other issues too.