Rahman ordered to fight Lewis
Earlier today a US District Court judge in New York declared Rahman must honour the re-match clause in his original contract with Lennox Lewis. Rahman has been ordered to fight Lewis within the next 18 months before he can defend his titles against anyone else.
Rahman upset Lewis in April in South Africa by knocking out the British fighter in five rounds.
King said he had made the $12.5 million offer on Monday and the Lewis camp was meeting to consider it on Tuesday. He said he had not heard an offer of more than $3m from Lewis.
King is currently promoting his 4 August card in Beijing, China, which features a third fight between World Boxing Association heavyweight champion John Ruiz and former champion Evander Holyfield.
Rahman was scheduled to make his first title defence on the card against David Izon but will still be going to China anyway as part of the broadcast team.
"I just want to fight Lewis and get it over with and move on to some better fights," said Rahman.