I appear to have missed something. I saw that there was a press conference, but not what about.
Trump & co lied (really badly*) that they didn't have the search warrant for the FBI raid on Mar a Lago and portrayed it as an unfounded, illegal raid by a politically controlled FBI and started shouting about how the warrant should be published to prove it was bullshit.
The republican media machine went after the (Trump appointed) judge and the (Trump appointed) head of the FBI and Merrick Garland, so Garland held a press conference and revealed what everyone with a brain already knew, Trump & his lawyers did have the search warrant. Not only that, but they're petitioning the court to make it public.
So now Trump is in a pickle because a) Everyone knows he has the warrant and can release it himself, and b) Now has to say publicly in court whether he wants it made public which means either saying yes and a document that clearly incriminates him is released, or no and the fact he's trying to cover up a document while yelling about it getting published is laid bare.
*On the day of the raid, Trump's lawyer went on Fox News and described what the warrant said, before they switched tactics to denying ever getting the warrant.