Trump told Ramos, who was trying to ask about immigration during the event in Dubuque, Iowa, repeatedly to "sit down."
A security guard removed him as he shouted that he was a "journalist and do not touch me."
Trump was later asked about the altercation and said he would welcome Ramos back into the room.
Ramos returned a short time later.
"We'd love for Mr. Trump to sit down for an in-depth interview with Jorge to talk about the specifics of his proposals," said Isaac Lee, CEO of Fusion -- ABC's sister network -- and President of News for Univision.
Meanwhile, Trump poached a top staffer from Rick Perry's campaign, Sam Clovis, the Iowa campaign director.