He questioned how Estrada was able to purchase that property when his declared net worth for 1999 was only 35 million pesos.
"We cannot have the country run by a thief like him," Arroyo said.
Displaying slides of mansions allegedly bought by Estrada, Arroyo said late dictator Ferdinand Marcos never bought such luxury houses and asked: "I wonder who is the bigger crook."
Presidential spokesman Ricardo Puno told reporters Estrada was "not particularly pleased with the rhetoric" against him.
"You are being insulted and you are being portrayed as wicked. ... Put yourself in his place and see whether you would be prepared to pretend that this is not happening," Puno said, adding that Estrada watched the proceedings on TV at the palace.
"He is eager for the process to start and to finish very, very soon so he can then get back to the main business of running the place," Puno added.
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