It is my understanding that his lawyers and all lawyers would advise their client not to do that....for many many many good reasons....none that are illegal, but all to protect the person, in this case, the president, from any further headaches or liabilities.
Also, by the president doing this, it now opens up his employees or ex employees being called back to the Special Counsel for another interrogation on what they discussed, which in turn means his employees will get hit with tens of thousands of dollars MORE in legal fees....
There is no executive privilege, unless the discussions are about USA policy and the likes, discussing the interrogation and what the employees told Trump, would not be covered...
So basically, all of these out of the ordinary moves by Trump, is costing hiss employees a fortune in lawyer fees,
and it only prolongs the Special Counsel's team investigation, and getting to the end....
Trump keeps making moves, that makes the investigation go longer and longer than necessary....
The person to blame for the length of this investigation, is Trump....and the Trump Team who ALL LIED about their contacts and dealings with the Russians, only later to be found out....
It almost makes me think Trump is trying to direct a reality show, and has no new script for the Season, so he is making certain this drama drags out..... for the audience to keep tuned in to the show, until the end of the Season finale....