“They don’t seem to get it. They’re so deranged," Collins said on Fox News Radio's "Todd Starnes Show." "They're so focused on getting this president that they have lost all track,’”
He added, "It’s a giant fishing expedition.".
Collins was reacting to the House Judiciary Committee’s Tuesday hearing with former Trump campaign manager Corey Lewandowski, which was part of the committee's impeachment inquiry.
Democrats traded insults and accusations with a combative Lewandowski, who refused to answer many of their questions.
After five hours of testimony, the top Democrat on the committee, Rep. Jerry Nadler, D-N.Y., told Lewandowski that his “behavior in this hearing room has been completely unacceptable,” and that holding him "in contempt" was "certainly under consideration."
“Corey handled himself very, very well. He answered the questions. He didn't take the bait and to go after it and in doing so he answered the questions forthrightly,” Collins said.
Collins said Lewandowski stood up for the president and his own actions, calling it the “spirit of America to stand up for what you believe in.”
“And also I made it a habit so that my chairman [Nadler] doesn’t get to do whatever he wants to do as long as I'm sitting there as ranking member and he can't abuse the rules. Can't do it without a fight from me.”
Fox News' Alex Pappas contributed to this report.