NBC News offers some explanation of why Rachel Brand has quit her job.

The Justice Department’s No. 3 attorney had been unhappy with her job for months before the department announced her departure on Friday, according to multiple sources close to Associate Attorney General Rachel Brand.

Brand grew frustrated by vacancies at the department and feared she would be asked to oversee the Russia investigation, the sources said.

The sources say the WalMart job had been in the works for some time.

As far back as last fall, Brand had expressed to friends that she felt overwhelmed and unsupported in her job, especially as many key positions under her jurisdiction had still not been filled with permanent, Senate-confirmed officials.

Four of the 13 divisions overseen by the associate attorney general remain unfilled, including the civil rights division and the civil division, over one year into the Trump administration.

Only one man matters.

While Brand has largely stayed out of the spotlight, public criticism of Deputy Attorney General Rod Rosenstein by President Donald Trump worried Brand that Rosenstein’s job could be in danger.

Should Rosenstein be fired, Brand would be next in line to oversee Special Counsel Robert Mueller’s investigation into Russia’s meddling in the 2016 election, thrusting her into a political spotlight that Brand told friends she did not want to enter.

A spokeswoman for the DoJ said none of it is true. We believe everything they say, yes? No.