A public relations aide to US President George W Bush has quit after admitting to plagiarising an academic in a newspaper column on education.
Timothy Goeglein has worked for Mr Bush since 2001
The White House earlier expressed disappointment at the "unacceptable" actions of Timothy Goeglein, who worked for the US president since 2001.
Mr Goeglein, whose column appeared in Indiana's News-Sentinel, had agreed he was wrong, the White House added.
The newspaper says it will not publish his writings in the future.
After a review of his published columns since 2000, the Fort Wayne-based newspaper added on Friday that 20 had been "found to have portions copied from other sources without attribution".
As deputy director of the Office of Public Liaison, Mr Goeglein assisted President Bush on outreach to different groups about his policies.
The Associated Press describes his role as "President Bush's middleman with conservatives and Christian groups".
Exposed by blog
Before his resignation, Mr Goeglein told the White House he had no excuses for his behaviour and offered an apology to the editors of the News-Sentinel.
The plagiarism was brought to light by a blogger, Nancy Nall, who posted a comparison of a Goeglein column with a Dartmouth College essay by Prof Jeffrey Hart on the goal of education.
White House spokeswoman Emily Lawrimore said the White House press office had been unaware that Mr Goeglein was writing a column.
"He recalls that he informed someone in the White House press office earlier in the administration," she added.