So how out of line was the Daily Caller’s Neil Munro when he interrupted President Obama’s formal announcement of his new immigration policy in the Rose Garden?

We asked the man whose persistence in shouting questions at presidents was the stuff of legend: retired ABC News correspondent Sam Donaldson.

Neil Munro of the Daily Caller listens to President Obama as he responds to his interruption during an announcement in the Rose Garden on Friday. (Haraz N. Ghanbari/AP)

He didn’t approve.

“I never interrupted any president while he was making a formal presentation of any sort. You don’t do that, do you?” said Donaldson, who titled his 1987 memoir “Hold On, Mr. President!”

Not that Donaldson ever let them slip away quietly. But he would wait until a president had finished his remarks, he said. And if the chief executive turned away without answering questions, Donaldson would fire away.

Donaldson was also famous for shouting questions as the president walked to and from his helicopter.