Mineral Wells, Texas - Gubernatorial candidate Beto O'Rourke turned the tables on a heckler who mocked him over the Uvalde mass shooting at a campaign stop, and his supporters loved every second of it.

O'Rourke commendably held his ground during a stop at the Crazy Water Hotel in Mineral Wells on his campaign tour.

During his time speaking to a crowd of supporters, the Democratic challenger to Texas Gov. Greg Abbott mentioned the mass shooting that took place at Robb Elementary School in Uvalde, Texas, that killed 19 kids and two teachers.

At that moment, a heckler who was holding up one of Abbott's campaign signs started to laugh at a high volume, causing O'Rourke to stop in his tracks before he could finish his critique of how easy it is to purchase "hundreds of rounds of ammunition" and assault-style weapons in Texas.

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After the heckler's interruption, O'Rourke uttered some words in their direction. "It may be funny to you, "motherf****r," he quipped, "but it's not funny to me."

Those in attendance were noticeably impressed by the former US representative's quick comeback to the unidentified disruptor, as the crowd cheered and applauded in a video posted on Twitter by Beto Media.

Following the tour stop, O'Rourke broke his silence on the viral moment, tweeting, "Nothing more serious to me than getting justice for the families in Uvalde and stopping this from ever happening again."

O'Rourke's campaign tour comes three months prior to Election Day when he's hoping to unseat Gov. Abbott who agreed to one debate with the El Paso native, though O'Rourke has reportedly signalled he'd like three.