Jack Smith wants to tell Congress about his Trump investigations. That comes with risks.

Jack Smith wants to make his case against Donald Trump to Congress — but he’s walking into a political and legal minefield.

The Biden-era special counsel who brought the first and only federal criminal charges ever leveled against a former president is set to testify behind closed doors Wednesday to the House Judiciary Committee.

To do so, he must navigate Byzantine secrecy laws and rules that limit what he can disclose to lawmakers. All the while, Republicans are looking to trip him up and incriminate him...