South Korea's special prosecutor is seeking an Arrest Warrant for Samsung heir apparent Lee Jae-yong, on bribery charges.
Samsung is accused of giving donations to non-profit foundations operated by Choi Soon-sil, a friend of Ms Park, in exchange for government favours.
The donations were allegedly made as it sought political support for a merger.
Mr Lee, also known as Jay Y Lee, was questioned for more than 20 hours at the prosecutor's office in Seoul last week.
He is currently vice-chairman of Samsung Electronics, but since his father, Lee Kun-hee, suffered a heart attack in 2014, he is considered de facto boss of the entire Samsung Group conglomerate.