WASHINGTON — For the first time in days, President Barack Obama and House Speaker John Boehner spoke by phone Wednesday about the "fiscal cliff" that threatens to knock the economy into recession, raising the prospect of fresh negotiations to prevent tax increases and spending cuts set to kick in with the new year.

Officials provided no details of the conversation, which came on the same day the president, hewing to a hard line, publicly warned congressional Republicans not to inject the threat of a government default into the already complex issue.

"It's not a game I will play," Obama told a group of business leaders as Republicans struggled to find their footing in talks with a recently re-elected president and unified congressional Democrats.