Rick Perry Once Forgot the Name of the Agency He May Lead

Perry is expected to be named as Trump's energy secretary pick.

During a presidential primary debate on CNBC in 2011, when then-candidate Perry was listing "three agencies of government, when I get there, that are gone," he was able to name Commerce and Education but blanked on the third, saying, "What's the third one there?"

When moderators asked him, after a pause, if he could recall the last one, he said, "I can't. The third one I can't. Sorry. Oops."

While Perry's biggest gaffe during the 2012 race may have come from what he didn't say, it's something he did say during this election cycle that he may regret now.

Despite these kerfuffles, Perry is expected to be named as Trump's choice for secretary of energy, senior transition officials told ABC News. Perry met with Trump at least twice in recent days.

If Perry is selected, his ties to energy companies will be in question as potential conflicts of interest. One of the clearest possible conflicts: his place on the board of directors of Energy Transfer Partners, which owns a subsidiary planning to build the Dakota Access Pipeline.

ABC News' Arlette Saenz contributed to this report.

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