Sen. John McCain (R-Ariz.) expressed reservations Tuesday night over whether Gen. Stanley McChrystal should be made to resign.

McCain, the ranking member of the Senate Armed Services Committee, said he was "concerned" by the prospect of McChrystal, the commander of U.S. troops in Afghanistan, having to resign over remarks he made to Rolling Stone magazine that were critical of President Barack Obama and other members of the administration.

“I’m sorry that he finds himself in this situation, but, obviously those words were not only unfortunate, but inappropriate," McCain said in an interview with Greta Van Susteren to air tonight on Fox News.

“I’m concerned that if General McChrystal has to resign, and he may, that what happens to the leadership in the middle of a very crucial time in Afghanistan," McCain said, "but, I respect the President’s decision as Commander in Chief on this situation.”

McChrystal has been summoned back to Washington to meet with Obama on Wednesday, and has reportedly offered his resignation to the president, which Obama could accept. The White House said Tuesday all options were on the table.