Jimmy Fallon has discovered the Republican Party’s new official handshake.

The “Tonight Show” host spotted an awkward moment between Donald Trump and Sen. Lindsey Graham (R-S.C.) after the former president won South Carolina’s Republican presidential primary on Saturday.

The crowd booed Graham as soon as Trump mentioned his name and invited him onstage at his victory party.

“Unfortunately, things got even more awkward from there,” Fallon said.

As Graham went for a fist bump, Trump returned it with a high five, placing his open palm against Graham’s closed fist.

“Those two couldn’t be any older or whiter,” Fallon said.

“Course they had to pretend Trump did that on purpose, so now it’s the official Republican greeting,” he added.

Watch his roast, and the flub, below.

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