The incident happened about an hour after the National Transportation Safety Board released new details​ about a similar incident in early August.
The NTSB said tower recordings show controllers never heard Marine One's Aug. 4 calls warning it was preparing to take off, though separate recordings confirm the calls were made.
When the helicopter that transports President Trump crosses the Potomac, Reagan Washington National Airport is required to impose a ground stop on air traffic.
The Iraqi leader was in Washington to meet with President Trump.