Suthep said the anti-government People's Democratic Reform Committee (PDRC) was ready to step in as soon as the judicial axe falls on the current cabinet.
“Once we become the sovereign, we'll seize the assets of the of the Shinawatra family members. We won't allow them to go abroad. They will need to report to us,” he declared.
“We will appoint the prime minister of the people,” he said.
The government called a snap election in February, but that was obstructed by protesters. Since then Thailand has been in a state of political paralysis.
The Constitutional Court later nullified the February poll.
The anti-government protesters accuse Yingluck of acting as a proxy for her fugitive brother, former premier Thaksin, who was ousted in a coup in 2006.
