House Speaker Nancy Pelosi must be taking night classes at the Alexandria Ocasio-Cortez School of Government.

Pelosi, the 79-year-old third-highest ranking official in the U.S. government, was speaking to the Center for American Progress today when she mistakenly said there are “two co-equal branches” of government, before correcting herself to say there are three.

Watch:

“First of all, let me just say, we take an oath of office to protect and defend the Constitution of the United States,” Pelosi said.

“Democrats take that oath seriously, and we are committed to honoring our oath of office. I’m not sure that our Republican colleagues share that commitment, and I’m not sure that the president of the United States does, too,” she claimed.

“So, in light of the fact that the beauty of the Constitution is a system of checks and balances— two co-equal branches— three co-equal branches of government,” she corrected with a laugh.

“A check and balance on each other,” she continued. “Con— Constitution spells out the pri— pa, uh, the duties of Congress and one of them is oversight of the president of the United States, another one of them is to impeach the president of the United States,” Pelosi said.

In November, Alexandria Ocasio-Cortez rallied supporters on Facebook to pitch in and help Democrats take back “all three chambers of Congress.”

“…the Progressive movement works and it wins in all districts…If we work our butts off to make sure that we take back all three chambers of Congress– three chambers of government…,” she said during the virtual appearance.

She clarified that she meant the “presidency, the Senate and the House.”

According to the Constitution, the three branches of government are the legislative, executive and judicial.