It's no secret that there is no love lost between President Barack Obama and his Republican rival, and in an interview with Rolling Stone, the president made that even clearer.

Douglas Brinkley recounts an episode at the close of his interview with Obama, in which the president called Romney a "bullshitter"

As excerpted by Mike Allen:

"We arrived at the Oval Office for our 45-minute interview ... on the morning of October 11th. ... As we left the Oval Office, executive editor Eric Bates told Obama that he had asked his six-year-old if there was anything she wanted him to say to the president. ... [S]he said, 'Tell him: You can do it.' Obama grinned. ... 'You know, kids have good instincts,' Obama offered. 'They look at the other guy and say, "Well, that's a bullshitter, I can tell."'"

UPDATE: Romney campaign spokesman Kevin Madden responded to Obama's remarks: "President Obama is rattled and on the defensive. He's running on empty and has nothing left but attacks and insults. It's unfortunate he has to close the final days of the campaign this way."