Donald TrumpDonald TrumpCapitol fencing starts coming down after 'Justice for J6' rally Netanyahu suggests Biden fell asleep in meeting with Israeli PM Aides try to keep Biden away from unscripted events or long interviews, book claims MORE is thumbing his nose at former Republican primary rivals and pundits who said that he wouldn't be able to secure the GOP presidential nomination.

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Trump posted a video late Thursday showing Mitt Romney and past candidates John Kasich, Jeb Bush and Ted CruzRafael (Ted) Edward CruzPoll: Trump dominates 2024 Republican primary field Republican politicians: Let OSHA do its job O'Rourke prepping run for governor in Texas: report MORE, as well as several pundits who insisted Trump wouldn't become the nominee.

The video, posted to his Instagram account, pivots to news reports Thursday finding that Trump had reached the necessary 1,237 delegates to clinch the party's nomination.

He then pokes at President Obama and suggests he'll rise to the next challenge: Winning the White House.

The video ends with remarks from Obama in February saying, "I continue to believe Mr. Trump will not be president."

"Let's see about that!" reads text to conclude the ad.