What concerns did Rachel Maddow raise about the Trump administration's handling of nuclear security personnel?

Rachel Maddow criticized how President Trump allowed his campaign donor to place inexperienced, unvetted young people with no subject matter expertise into the National Nuclear Security Administration, the agency responsible for keeping America's nuclear weapons secure. These appointees then fired experienced nuclear security personnel without understanding their roles or responsibilities. Maddow emphasized the dangerous consequences of these actions, noting that these firings occurred with no apparent contingency plan to bring back the dismissed experts once the administration realized their mistake. This reckless approach to personnel management potentially compromised the security protocols necessary for maintaining America's nuclear infrastructure and weapons security.