"Was there a physical wiretap of Trump Tower? No, but there never was," Nunes said on "Fox News Sunday."
He said that information the House Intelligence Committee received from the FBI on Friday "continues to lead us in that direction."
"The President doesn't go and physically wiretap something. So if you take the President literally, it didn't happen," Nunes said. "I think the concern that we have is that, were there any other surveillance activities that were used."
"I just want to make that point," Chris Wallace said. "There is no evidence that there was any wiretap, I'm not talking about President Obama doing it but his administration, no evidence of any wiretapping of Trump Tower?"
"There was no FISA warrant that I'm aware of to tap Trump Tower, that's correct," Nunes said. "That's accurate."
President Donald Trump has maintained his claims that President Barack Obama's administration "wire tapped" his phones at Trump Tower despite a lack of evidence to substantiate his allegations, which have faced pushback from Republicans and Democrats alike.