He faces a maximum sentence of not less than five years or more than 20 years in federal prison and a $250,000 fine.
Judge Cummings ordered a presentence investigation report with a sentencing date to be set after the completion of that report. McGinn, in the meantime, remains in federal custody.
According to documents filed in the case, McGinn used his computer, which was connected to the Internet, to access music and various forms of pornography through the use of file-sharing software.
Specifically, McGinn used the software to collect and share hundreds of images of child pornography.
The case is being investigated by the FBI and the Texas Department of Public Safety. Assistant U.S. Attorney Steven M. Sucsy is in charge of the prosecution.