On Aug 27, 2005, two days before Hurricane Katrina made landfall, officials at the American Red Cross wrote to a top homeland security adviser at the White House, warning that the storm was likely to slam New Orleans as a major hurricane.

The message was sent to Kirstjen Nielsen, whose title was special assistant to the president for prevention, preparedness and response. She was 33 years old.

It was the first of many alarming emails Nielsen would receive over the following days as water poured into New Orleans and the city was deluged. And in the storm of blame that followed the costliest natural disaster in American history, Nielsen's team was widely criticized for its passive and clumsy response.

Twelve years later, President Trump has nominated Nielsen to the top job at the Department of Homeland Security. As DHS secretary, she would be in charge of a 240,000-employee agency with a $40 billion budget whose many responsibilities include managing disasters such as Hurricane Maria in Puerto Rico.