"He got up after I showed him videos of young people eating out of a bin lorry," he said of the interview at the Miraflores palace in the capital, Caracas.
"What I told Nicolás Maduro is that millions of Venezuelans and many governments around the world don't consider him a legitimate president but a dictator."
During their detention, Mr Ramos and Univision Vice President María Martínez were kept for "a few minutes" in a separate room where the lights were turned off, the broadcaster said.
The Univision crew will be deported on Tuesday, Reuters news agency reports.
Mr Ramos, a veteran Mexican-born American journalist, is known for his confrontational style of questioning. In 2015, he was thrown out of a news conference of then-presidential candidate Donald Trump.
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