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 Rodham ClintonPro-Trump group pulls ads targeting GOP senator on ObamaCare repeal Stone to testify before House Intel Committee next month Overnight Cybersecurity: New ransomware attack spreads globally | US pharma giant hit | House intel panel interviews Podesta | US, Kenya deepen cyber partnership 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 TrumpScarborough defends CNN against Trump: CNN 'has more integrity' Time asks Trump Organization to remove fake cover from golf clubs Why UK millennials voting for socialism could happen here, too 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 PenceMike (Michael) Richard PenceSenate Democrats: ObamaCare repeal fight isn't over yet Gingrich: Trump will be reelected, then Pence will win in 2024 Funeral for the filibuster: GOP will likely lay Senate tool to rest 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."