A delegation of three U.S. senators, including Arizona Sen. John McCain, will be in Egypt on Monday to meet with the country's military leaders to discuss the case of 19 American workers who face charges as part of an Egyptian crackdown on nongovernmental organizations.

"I think this is a very difficult situation," McCain told ABC's "This Week" on Sunday. "I am not a negotiator, but I think it's important that I and the other senators in the delegation explain to the Egyptian leadership ... that this is a serious situation, has serious implications for our relationship,"

The delegation also includes Sens. Lindsey Graham and Joe Lieberman. The visit is part of a pre-planned trip.

McCain said that while he will address the situation of the detained Americans, he will not attempt to negotiate their release.