Christie responded Wednesday, telling reporters at a press conference that “Brown can have that contest with himself.”

The California governor, however, stood by his invitation Sunday, saying he got “warmed up” in the speech where he initially called for the face-off.

“I’m old. Yes, well, I’m 74. I’ll be 74 and a half next month,” Brown said Sunday. “But here I am. You know, there is some experience. Hopefully, there’s some wisdom. So I got kind of warmed up.”