Former United Nations' American ambassador John Bolton continued his campaign to have the country of Iran bombed Tuesday evening, feeling that Israel should have accomplished the task several years ago.

Appearing on Fox News' On The Record with Greta Van Susteren, Bolton expressed to van Susteran how Israel needed to be clever with its approach to any military action with Iran.

"I thought the Israelis should have struck about three and a half years ago," he said. "So as far as I'm concerned, everyday that goes by just increases the risk that our intelligence maybe imperfect. I just throw that out there for what it's worth. Iran could be a lot farther along to developing nuclear weapons than we think."

Bolton has been a constant supporter of bombing Iran, advocating for the position on multiple occasions over the years. The former Bush administration official is also an advisor to Republican presumptive presidential nominee Mitt Romney, who has expressed on the campaign that he would be open to a military strike on Iran.

"I will buttress my diplomacy with a military option that will persuade the ayatollahs to abandon their nuclear ambitions," Romney said. "Only when they understand that at the end of that road lies not nuclear weapons but ruin will there be a real chance for a peaceful resolution."

Former Romney strategist Richard Grenell, who left the campaign after conservatives objected to the fact that he was openly gay, was Bolton's spokesperson during his time as American ambassador to the UN.

WATCH: Video from Fox News, which was broadcast on May 15, 2012.