The debut marks an entirely new generation of entertainment and hospitality projects in the USA -a fully integrated resort in the heart of a major metropolitan area, according to the company.
Speaking to a local Fox affiliate afterwards, Mr. Caldwell claimed he had consumed one or two cocktails during the grand opening event.
The 3,000-seat Theater at MGM National Harbor, which will be operated with promoter LiveNation, will open on December 27 with a concert by Bruno Mars.
Prince George's County police and The National Harbor Traffic Command Center are continuing to monitor and direct traffic.
- Visitors considering making a trip to the newly-opened MGM National Harbor casino and resort may want to reconsider stopping in for another time.
The resort has plenty of the "magic touches" that MGM patrons have come to expect from the company whose assets include the stunning Aria and Bellagio resorts in Las Vegas and the glistening gold and silver MGM Macau, among its 26 properties across the globe.
The $1.4billion casino filled to capacity within an hour of it's opening.
A spokeswoman for MGM National Harbor also said the fight was broken up in about a minute. "I believe they made a mistake", he said. "We wanted to celebrate the heritage and beauty of the region". It's not just about being a destination resort, but it's a statement for the industry.
The National Harbor area, which sits across the Potomac River from D.C., was backed up for miles.
A king guest room at the MGM National Harbor. The boutique hotel has 308 guestrooms, including 74 suites ranging in size from 400 to 3,210 sq. ft. and floor-to-ceiling windows.
According to officials, as many as 90,000 vehicles will travel into National Harbor in an average week.
It was a shiny, splashy start for Maryland casino number six.