Hariri has fled Lebanon for Saudi Arabia. Aoun said Hariri's remarks in a televised interview on Sunday night showed that the political deal underpinning Lebanon's coalition government still stands, the visitors to the president said.
Saudi-allied Hariri said he would return to Lebanon within days and held out the possibility he could rescind his resignation if Iran-backed Hezbollah agreed to stay out of regional conflicts such as Yemen.
Hezbollah is part of the coalition government led by Hariri.
The comments were Hariri's first in public since his shock resignation declared from Riyadh on November 4.
Top Lebanese government officials and senior sources close to Hariri believe Saudi Arabia coerced Hariri into quitting and has put him under effective house arrest since he flew to Saudi Arabia over a week ago.
Aoun said on Sunday that Hariri's movements were being restricted in Riyadh, the first time the Lebanese authorities had publicly declared their belief that Saudi Arabia is holding him against his will.
Ahead of Hariri's interview, Aoun had also said that the restrictions on his freedom threw doubt on anything Hariri had said or would say, and that his statements could not be considered a statement of free will.