The new ballot system could open a window for a political party to win the next election by a landslide, Deputy Prime Minister Wissanu Krea-ngam said on Friday.
He was answering a reporter's question about a party's announcement that it intended to win an overwhelming majority in the next general election.
Mr Wissanu said the amendment to the charter to revert to the use of two ballots and change the composition of the House was intended to pave the way for such a result.