President Donald Trump's remarks this week blaming diversity recruitment at the FAA as a potential reason for the plane crash that killed 67 people has drawn attention to the agency’s attempts to address its most pressing and long-standing staffing problem.

He told a news conference that diversity hiring efforts at the Federal Aviation Administration may have led to safety issues.

A midair collision near D.C. has raised concerns over FAA staffing, prompting scrutiny of air traffic control and aviation safety oversight.