In her attempt to take a swipe at Donald Trump, Hillary Clinton tweeted last Thursday, “The most important quality in a president and Commander-in-Chief is steadiness—an absolute, rock solid steadiness.”

The most important quality in a president and Commander-in-Chief is steadiness—an absolute, rock solid steadiness. pic.twitter.com/QwQBzZc0xb — Hillary Clinton (@HillaryClinton) September 9, 2016

She exhibited anything but “an absolute, rock solid steadiness” on Sunday when she collapsed on a New York City street.

Clinton reportedly left a 9/11 remembrance ceremony and was helped to her motorcade van.

Video captured a listless Clinton nearly fall backwards.

She could be seen leaning against a security pillar — and being held up — as the van approached the curb.

She began stumbling and appeared to begin falling backwards.

Staffers and a Secret Service agents grabbed her by the arms as her knees buckled and she began to collapse. They forced her into the van.

Other agents and aides blocked the view as she was carried head-first into the vehicle.

Later on Sunday, it was disclosed that she was apparently diagnosed with pneumonia on Friday — just one day after her “steadiness” declaration.