Looking back at history over the last 10 years or so, consider this: what did Trump do when they were investigating him for Russian collusion? Did he shut it down? No, he let it play out. What did he do regarding the Ukraine quid pro quo? Did he shut it down? No, he let it play out. The COVID situation, the 2020 election—he let them all play out. Trump always lets things play out. Even on January 6th, he let it play out.
You catch criminals by letting them reveal what they are doing; that is how you gather evidence and how you win. Trump exploits the weaknesses of his enemies. Remember: that is the Trump strategy.