Thousands of angry protesters demanding her removal are outside the National Assembly's main gate.
Ms Park is embroiled in a political scandal that has sparked many protests.
At the heart of this scandal is the relationship between Ms Park and a confidante, Choi Soon-sil, accused of using connections to gain influence.
Prosecutors say Ms Park had a "considerable" role in the alleged corruption, which she has denied.
She has also resisted calls to step down, insisting that she would leave the decision up to parliament.