US President Barack Obama has poured accolades on Vice President Joe Biden as he is considering to run for the White House.

In an interview with CBS News on Sunday, Obama, however, stopped short of disclosing whom he will support in the 2016 presidential election.

“I think Joe will go down as one of the finest vice presidents in history, and one of the more consequential,” Obama said. “I think he has done great work.”

When asked whether the president wants his vice president to join the race, Obama said he will “let Joe make that decision.”

Biden is expected to make a decision whether to run for president in the coming days.

The vice president, however, has said he does not know if he has the “emotional fuel” for a campaign to dislodge Democratic frontrunner Hillary Clinton from the top position in the race.

In his interview, Obama also weighed in on Clinton’s email controversy, saying that while her use of a private server was a "mistake," he didn't think it jeopardized America’s national security.

"She made a mistake. She has acknowledged it. I do think that the way it's been ginned up is in part because of politics," Obama said."

"I think she'd be the first to acknowledge that maybe she could have handled the original decision better and the disclosures more quickly."

Clinton, who ran for president in the 2016 presidential election, is in the middle of a scandal over using a personal email server when she was the secretary of state during Obama’s first term.

She has attracted plenty of criticism from Republicans for her lack of transparency and political gaffes since the administration of her husband, former President Bill Clinton.

Clinton is competing against only three Democrats and independent senator Bernie Sanders, for the Democratic Party's nomination. Only Sanders is considered at all competitive in the early primaries.