The highest-ranking career Treasury official resigned after a fight with Elon Musk’s Department of Government Efficiency associates over access to sensitive payment systems. David A. Lebryk, who has served in nonpolitical roles at the Treasury Department since 1989,

U.S. Army helicopter collided with a descending American Airlines passenger plane over the Potomac River en route to the Reagan National Airport in Washington, D.C. There were no survivors. The Federal Aviation Administration (FAA) — which is experiencing a severe vacancy of top leadership positions — has come under fire for suspected negligence amid a staffing and funding deficit.

Here's a look at how the tragedy unfolded, as the cause of the collision remains under investigation. MORE: DC plane crash live updates Wednesday, Jan. 29 5:38 p.m. CT: American Airlines Flight 5342 departs from Wichita,