Mr. Powell confirmed his participation later in the day.
A similar event was planned for the Democratic candidates, but none would confirm their participation.
The 15 teams from the previous season confirmed their participation.
In the past, they have preferred to confirm their participation in international interventions already announced by other central banks.
Twenty teams confirmed their participation in this year's tournament.
Eleven countries confirmed their participation in the first edition of the competition.
The remaining clubs were given a deadline until 6 June 2011 to confirm their participation in the 2011-12 season.
Swiss Bank declined to confirm or deny its participation.
Two countries have confirmed their participation for the second edition of the competition.
So far two countries have confirmed their participation in the 2013 edition of the Song Festival.