Rudy Giuliani brings the house down at RNC

Rudy Giuliani delivered a rousing speech on the opening night at the Republican National Convention in Cleveland on Monday. The former New York City mayor offered a fiery message to terrorists that brought the convention floor to its feet.

"You know who you are, and we're coming to get you," said Giuliani.

The theme for night one of the convention was "Make America Safe Again," and Giuliani pushed for a more clear label for the United States' enemies. "We must not be afraid to define our enemy,' Giuliani said. "It is Islamic extremist terrorism."

Click through images from the RNC here:

"This is why our enemies see us as weak and vulnerable," Giuliani said. "Donald Trump said the first step to defeating our enemies is to identify them properly and to identify the connections between them so we can see them and catch them."

The former mayor also said he fixed up New York City during his time as mayor, and promised Trump would do the same for the country if elected president in November.

"I know we can change it, because I did it by changing New York City from the crime capital of America to the safest large city in the United States. What I did for New York, Donald Trump will do for America," Giuliani said.

Giuliani said that Trump is "a man with a big heart," and revealed that the billionaire businessman made anonymous donations to help police officers and firefighters, including after the terror attacks on 9/11.

"I am sick and tired of the defamation of Donald Trump by the Clinton campaign," Giuliani said regarding the onslaught of negativity coming from Trump's Democratic opponent. "I am sick and tired of it. This is a good man. And America should be sick and tired of this vicious, nasty campaign."

The former mayor earned the loudest reaction of the night when he spoke passionately regarding the issue of the police. Giuliani said, "when they come to save your life they don't ask if you're black or white, they just save you."