The government paid Boeing $15 million of its initial $20 million contract before determining that there were glitches in the test project. The department gave a conditional acceptance in December.
Lawmakers have been skeptical of the product Boeing delivered.
"This is not the end of the Project 28 story," Rep. Christopher Carney, D-Pa., said in a statement Thursday. "We need to understand what went wrong with Project 28 to ensure that the mistakes of the past are not repeated and taxpayer dollars are not squandered."
More tax money wasted by the Republicans when they already had assets in place to secure the border. Pathetic.