This prompted Harris to come out against O’Rourke’s call to tear down the existing 700 miles of fencing on the U.S.-Mexico border during a Wednesday night appearance on Comedy Central’s “The Daily Show.”

“No, I believe that we need border security,” said Harris, who has opposed President Trump’s immigration policies in the Senate.

“But we need smart border security. We can’t have open borders, we need to have border security, all nations do,” she continued. “All nations define their borders, but we should not have a policy and perspective that is grounded in keeping people out for the sake of this nationalistic kind of thing this president is trying to push.”