Former New York City Mayor Rudy Giuliani on Monday said terrorists failed to successfully strike the United States in the eight years before President Obama and former secretary of State Hillary ClintonHillary Diane Rodham ClintonChris Murphy’s profile rises with gun tragedies DNC, RNC step up cyber protections Gun proposal picks up GOP support MORE took office.

"Under those eight years, before Obama came along, we didn't have any successful radical Islamic terrorist attack in the United States," Giuliani said Monday ahead of a speech by Republican presidential nominee Donald TrumpDonald John TrumpIvanka Trump pens op-ed on kindergartners learning tech Bharara, Yates tamp down expectations Mueller will bring criminal charges Overnight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open MORE on foreign policy.

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"They all started when Clinton and Obama got into office."

Giuliani was the mayor of New York City during the Sept. 11, 2001, terrorist attacks. In making the remarks about terrorism, he was commending Trump's running mate, Indiana Gov. Mike PenceMichael (Mike) Richard PenceDems face close polls in must-win Virginia Report: Trump administration officials urged furious Tillerson not to quit Authorities recover 47 firearms in connection with Las Vegas shooter MORE, for his work in Congress after 9/11.

"He's a member of the Foreign Affairs and Judiciary committees, and during the time of Sept. 11, when we went through the worst foreign attack in our history, since the War of 1812," Giuliani said.

"Remember, we didn't start this war. They did. We don't want this war. They do. And they didn't start it even in 2001. They attacked the World Trade Center in 1993 and they attacked it under the ideology of radical Islamic extremism to create a caliphate. ... Mike Pence understands this."