Last year, investigative newspaper ProPublica unearthed "inconsistencies" in Trump's tax documents for the businesses he ran in Manhattan, which is likely what AOC is referring to.
He also famously did not release his tax returns after being elected, despite it being customary for a new president to do so.
Trump did inherit vast amounts of wealth from his family before setting up his own business.
Remember when, in 2015, he claimed that his career "has not been easy" because he had to pay back his father a "small loan" of a million dollars?
Trump was then elected president in 2016, despite having no formal experience in politics.
Alexandria Ocasio-Cortez, on the other hand, is so iconic that there's an entire Netflix documentary about the way she and other young, progressive women of colour shook up US politics after being elected to Congress in 2018.
She has since taken on designing a Green New Deal for the US and helped to raise more than $300,000 to protect young trans people.
Perhaps unsurprisingly, Trump's comment about AOC wasn't his only erratic statement in his rose garden address.
The president tried to claim that Joe Biden is "far right" and that the EU was formed to "take advantage of the United States".
He was only supposed to give a short statement about the America's relationship with China.