WATCH: Kerry Slams Gaza Incursion: 'It's a Hell of a Pinpoint Operation'

U.S. Secretary of State John Kerry was caught on open mic speaking to one of his advisors on Sunday, saying sarcastically "It's a hell of a pinpoint operation," referring to Israel's operation in Gaza.

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"We've got to get over there," he said, just before an interview for Fox News Sunday. "We ought to go tonight. I think it's crazy to be sitting around."

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Earlier it was reported that Kerry was set to arrive in the Middle East on Monday to promote efforts for a cease-fire between Israel and Gaza. Kerry was slated to land in Cairo, and head for Israel on Tuesday.

In an interview for NBC's "Meet the Press," Kerry said Israel "has every right in the world to defend itself" from attacks by Hamas militants in Gaza, but the U.S. is working diligently to get an immediate cease-fire in place.

Kerry said Israel long has endured rocket attack by Hamas, and no nation "would sit there while rockets are bombarding it."

Kerry also cited tunnels constructed by Hamas in what he said was "an obvious effort" to try to kidnap Israelis.

Kerry told NBC's "Meet the Press" that it's "unacceptable by any standard anywhere in the world" and that Israel must protect its citizens.