Over the past two years, many Americans feared that President Donald Trump would trigger a constitutional crisis by firing special counsel Robert Mueller and shutting down the Russia investigation. Mueller’s final report makes one thing clear: The investigation survived not because of the president’s faithfulness to the rule of law, but because of the faithlessness of Trump’s subordinates when they were instructed to subvert it.

“Comey did not end the investigation of Flynn, which ultimately resulted in Flynn’s prosecution and conviction for lying to the FBI,” Mueller wrote in his 448-page report, which was released with partial redactions on Tuesday. “McGahn did not tell the acting attorney general that the special counsel must be removed, but was instead prepared to resign over the president’s order. Lewandowski and Dearborn did not deliver the president’s message to Sessions that he should confine the Russia investigation to future election meddling only. And McGahn refused to recede from his recollections about events surrounding the president’s direction to have the Special Counsel removed, despite the president’s multiple demands that he do so.”

Their unwillingness to carry out the president’s wishes saved all of them from obstruction of justice charges, Mueller wrote. The special counsel explained that while his report “does not conclude that the president committed a crime, it also does not exonerate him.” There’s another troubling takeaway from Mueller’s account, though. One can’t help but notice that all of the people listed by Mueller no longer directly work for him. Would their replacements also be willing to stand up to the president?

After all, Trump infamously fired James Comey, the former FBI director, in May 2017 because of the Russia investigation. He also fired Jeff Sessions, who ignored Trump’s pleas to un-recuse himself from the inquiry while serving as attorney general, last November. Rick Dearborn, the White House deputy chief of staff who declined to pressure Sessions on Trump’s behalf, left the White House early last year. And Don McGahn, who disregarded Trump’s orders to fire Mueller on two separate occasions, left his post as White House counsel last October. (Corey Lewandowski never held a government job; he currently works as a TV commentator.)

The question is no less urgent now that the Russia investigation is over. Other inquiries are still active that could draw the president’s ire. Foremost among them is the Southern District of New York’s ongoing investigation into the Trump Organization, which began with Trump lawyer Michael Cohen’s conviction for illegal hush-money payments. Federal prosecutors in D.C. are reportedly probing the Trump inaugural committee’s donors and expenditures. Mueller also listed more than a dozen redacted matters that he referred elsewhere in the Justice Department, though it’s not clear whether any are connected to Trump or his associates.