Correction: This story originally included an incorrect title for Kimberlynn Reeves. The error has been corrected.

A hearing on the case of a U.S. Secret Service officer who was charged with soliciting a minor for sex after he allegedly texted an undercover detective posing as a 14-year-old girl has been postponed.

Lee Robert Moore was expected to appear Wednesday in U.S. District Court in Delaware for a detention hearing, which typically involves prosecutors putting “forth evidence to keep the defendant detained,” according to Kimberlynn Reeves, a spokeswoman for the U.S. Attorney’s Office in Delaware .

But that hearing was postponed, she said. It was not immediately clear why, but the federal detention center in Philadelphia where officials said Moore is being held has a chicken pox outbreak. It is not known if Moore has the illness.

A recording on the prison’s phone line said several cases of chicken pox had been identified, and it was temporarily suspending visitation. According to the Associated Press, a prosecutor in that area said he had been informed that all inmates are also being quarantined at the facility.

A new court date for Moore has not been set, according to Reeves.

Lee Robert Moore, 37, a Secret Service agent was arrested on charges of trying to solicit a teenage girl for sex. (Delaware Department of Justice via Getty Images)

Moore, 37, who lived on the Eastern Shore, faces a federal charge of attempted transfer of obscene material to a minor. He surrendered to the Maryland State Police in mid-November. Also on Wednesday, a grand jury in Wilmington indicted him on that charge.

The investigation into Moore began when a Delaware state trooper assigned to the Child Predator Task Force made a computer profile of a girl on an Internet site called “Meet24” and began talking online with a person named “Rob,” according to court filings.

According to court documents, the officer sent photos of himself to the trooper — including one of him wearing a tactical vest — and engaged in lengthy, sexually explicit text-messaging sessions, sometimes from a break room at work. Another time, he admitted to texting from a guard booth where he was checking in visitors to the White House, the criminal complaint says. On that day, the court document says, Moore complained about his assignment and asked to be sent to “something exciting.”

Moore was put on leave after the Secret Service was notified of the case.

Carol D. Leonning contributed to this report.