Washington (CNN) - White House Press Secretary Robert Gibbs is standing by his critique of what he called the "professional left."
"I think I have both my feet firmly planted on the floor and nothing in my mouth to speak of," Gibbs said Wednesday during his daily briefing, after being asked if he had put his foot in his mouth.
In an interview with The Hill newspaper earlier this week, Gibbs went public with his private frustration over harsh criticism from his party's base.
"I hear these people saying he's [Obama's] like George Bush," Gibbs told the paper. "Those people ought to be drug tested."
The White House has been under fire from liberal Democrats frustrated that some campaign promises have not been kept, including the closing of the Guantanamo Bay detention facility and a health care overhaul that didn't include a so-called public option.
In defending the administration's agenda, Gibbs focused on accomplishments, and insisted that "a lot of the issues that Democrats throughout the party have worked to see happen have come to fruition."
But his blunt swipe at his own party, so close to the midterm elections has rattled some Democrats.
The controversy is providing ammunition for both Republicans and Democrats.
The Progressive Change Campaign Committee is trying to raise money off Gibbs comments. In an email, the liberal political advocacy group called on supporters to "chip in $4 dollars to support our work."
Gibbs was asked at Wednesday's briefing about media reports that Democratic Rep. Keith Ellison called for his resignation. Ellison released a statement Tuesday night calling those reports "inaccurate."
The White House spokesman, who has become adept at using humor to deflect criticism, said "there's no truth to the rumor that I've added an inflatable exit to my office."
The joke was a play on the Jet Blue Flight attendant who exited his flight in such dramatic fashion earlier this week.
(Updated at 8:05 p.m. ET)