What concerns did Rachel Maddow raise about Trump's staffing decisions in America's nuclear security agencies?

Rachel Maddow criticized the Trump administration for allowing inexperienced individuals with no subject matter expertise to take positions in the agency responsible for America's nuclear weapons security. According to Maddow, the President permitted his campaign donor to send unvetted young people into critical nuclear security roles, who then fired experienced professionals without understanding their importance. Maddow emphasized the recklessness of this decision, pointing out that these inexperienced appointees apparently had no understanding of what the dismissed employees actually did, and the administration had no plan to rehire these experts once they realized their mistake. This approach to staffing critical national security positions represented a significant risk to America's nuclear security infrastructure.