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 ClintonIntel Dem decries White House 'gag order' after Bannon testimony 'Total free-for-all' as Bannon clashes with Intel members Mellman: On Political Authenticity (Part 2) 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 TrumpDems flip Wisconsin state Senate seat Sessions: 'We should be like Canada' in how we take in immigrants GOP rep: 'Sheet metal and garbage' everywhere in Haiti 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 PenceThe House needs to help patients from being victimized by antiquated technology 'The Wire' star: I'd prefer a President Pence because he's a 'simpleton and a puppet' Trump looks to steer UN effort on Afghanistan, with McMaster and Haley at the helm 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."