Sen. John McCain (R-AZ) cast doubt Sunday on the future of the head of the Republican Party following controversial comments about the war in Afghanistan.

At a Thursday fundraiser, RNC Chairman Michael Steele was caught on video saying that the Afghanistan war was a "war of Obama's choosing" and probably a "lost cause."

ABC's Jake Tapper spoke to McCain Sunday about Steele's remarks. "Republicans such as Congressman Tom Cole, William Kristol, Liz Cheney, have said that Michael Steele needs to resign because of those comments. Do you think a chairman of the Republican National Committee can be effective if he thinks that the war in Afghanistan is unwinnable as Steele seems to think?" asked Tapper.

"I think those statements are wildly inaccurate, and there's no excuse for them," said McCain.

"The fact is I believe Mr. Steele is going to have to assess if he can still lead the Republican Party as chairman of the Republican National Committee and make an appropriate decision," he said.