There’s only one person who can most effectively call Trump “Donald Duck” and that’s Phil Robertson.

The “Duck Dynasty” star appeared in Iowa Saturday to rally support for Trump rival Ted Cruz.

“Since ol’ Donald ducked that debate,” Robertson said, referring to the one-on-one debate challenge issued by Cruz, “we’ve been calling him Donald Duck and that’s where I come in.”

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“So let’s give ol’ Donald a hoot!” Robertson said before sounding the duck call.

He encouraged the people in the room — who were given duck calls — to do the same.

“Blow your duck calls Iowa! We’re trying to call ol’ Donald in on the debate!”

Robertson was in Sioux City stumping for Cruz.

https://twitter.com/catblackfrazier/status/693627004051132416

Earlier this month, Robertson endorsed Cruz and appeared in a campaign video for him.

“My qualifications for President of the United States are rather narrow,” Phil Robertson says in the ad.

“Is he or she godly? Does he or she love us? Can he or she do the job? And finally, would they kill a duck and put ’em in a pot and make a good duck gumbo?

“I’ve looked at the candidates. Ted Cruz is my man. He fits the bill.

“He’s godly. He loves us. He’s the man for the job and he will go duck hunting,” Robertson says.

The ad shows Robertson and Cruz shooting at ducks in the sky.

“Cruz, the reason we’re going to vote for you — all of us — is because you’re one of us, my man,” Robertson tells Cruz while they’re sitting in the blind. The candidate has a rare moment where he’s a many of few words and only mutters a nearly inaudible response.

“It’s now or never,” Robertson says as the ad concludes.