“make him explain this stonewalling”
What’s to explain? Strzok lied with his characterization of Hillary Clinton’s actions regarding the handling of her e-mails, so she wouldn’t be prosecuted; and, as the FBI’s resident Russia expert he lied about a need for an investigation in order to try and politically damage the president, answering Clinton’s call to “resist” and to buy time for her.
We know these things now; or as president Trump stated in a tweet the other day, “This explains a lot of things.”
Mueller knew these things but kept them to himself. He may face malicious prosecution and abuse of legal process charges. He knew Strzok was a partisan and that he lied.
In sum, this evidences what most of us here said it was all along: a political scalp hunt, not a search for truth, as well as an attempt to keep the focus off Hillary Clinton’s many crimes; or as she is reputed to have said, “If I lose we all hang from nooses.”
Sunlight is the best disinfectant. These swampers want to pull strings in the shadows. They need to be testifying under oath. If they want to spring perjury traps then turnabout is fair play as they say.