President Joe Biden on Saturday expressed regret for referring to Laken Riley’s alleged murderer as “an illegal.”

Liberals criticized Biden’s use of the term when describing the 22-year-old nursing student’s alleged murderer Jose Antonio Ibarra during his State of the Union address Thursday after Republicans demanded the president say Riley’s name during his speech. Biden told MSNBC’s Jonathan Capehart that he should have used the term “undocumented” instead.

“An undocumented person. And I shouldn’t have used illegal, it’s undocumented,” Biden said on “MSNBC Reports.”

“And look, when I spoke about the difference between Trump and me, one of the things I talked about in the border was is the way he talks about vermin, the way he talks about these people polluting the blood. I talked about what I’m not going to do. What I won’t do,” he added.