Sen. John McCain’s daughter, Meghan McCain, was on “The O’Reilly Factor” tonight, where she sounded off on the ISIS threat.

The Arizona senator has been vocal about his views on the issue, calling for American troops to confront ISIS.

McCain on U.S. Strikes vs ISIS: 'If It Weren't So Tragic It'd Almost Be Farce'

“This may surprise you, but I completely agree with my father,” Meghan McCain told Bill O’Reilly. She noted that everything Sen. McCain and Sen. Lindsey Graham have said would happen in the Middle East after we left Iraq has indeed happened.

Meghan McCain said that she has two brothers in the military and knows the cost of war, but she said there’s no other option as ISIS continues to grow.

McCain: Obama’s ‘Dog Ate My Homework’ Routine Is Getting Tiresome

“It’s not like I want America to go to war, but I think we must deal with this.”

Watch more above.