"Why he would do something like this is beyond comprehension," Walker said.
A third Drexel student, Devon Bond, has been accused of hatching a scheme to rob an off-campus apartment he believed to be full of money.
Harris and Phillip were enlisted as the gunmen, Walker said, but the three found no money and netted nothing but a cell phone.
Bond, of Marlton, N.J., surrendered to police on Friday. Arrest warrants were issued for Harris and Phillip on Saturday. All three men are 21 years old.
Robert Lynch, an attorney for Harris, described his client as "an excellent student" from a "great family" in New York City. He also said the source of the allegations against Harris was "corrupt," but he refused to elaborate.
"We look forward to our day in court to defend against these allegations," Lynch said. "We expect (Harris) to continue to be a successful student and basketball player."
Leon Aristotle Williams, an attorney for Phillip, said he was investigating the allegations and didn't want to speak for fear of harming his case.
It was unclear who was representing Bond.
In a statement, Drexel University said the three students would be placed on "interim suspension pending the outcome of the investigation."
The fate of Harris and Phillip as basketball players remained unclear Monday. Head basketball coach Bruiser Flint and other officials in the athletic department did not respond to multiple calls for comment.
Harris, a 5-foot-10, 170-pound point guard, has become the face of Drexel's basketball program.
A three-year starter, he was a third-team all-Colonial Athletic Association selection this past season after averaging a team-leading 14.5 points and 3.4 assists per game.
Always polite and soft-spoken to the media, Harris was the main player Flint depended upon for on-the-court leadership.
