Washington (CNN) - Former New York City Mayor Rudy Giuliani defended one embattled Republican Tuesday, but slammed another.
In an interview on CNN's The Situation Room, Giuliani said Republican National Committee Chairman Michael Steele should not resign, and explained why he endorsed Marco Rubio over Charlie Crist in the Florida Republican Senatorial primary.
"I believe Michael [Steele] should remain exactly where he is," Giuliani said as Steele continued to face criticism about his leadership of the RNC.
"Somebody made a very serious mistake – very embarrassing, terrible mistake," said Giuliani referring to embarrassing revelations that the RNC had picked up a nearly $2,000 tab at a bondage-themed West Hollywood nightclub for a group of young donors. "It's something Michael certainly didn't sanction, something Michael didn't want."
"I think Michael [Steele] has us on a good track. We've won three major elections in a row," Giuliani added, referring to Republican wins in governors races in Virginia and New Jersey and the Republican pick up of the Senate seat held by the late Massachusetts Sen. Edward Kennedy.
The former New York City mayor said he is backing Rubio over Crist, because "I think Marco Rubio best reflects smaller government, lower taxes and a very strong national defense."
"Charlie [Crist] supported the stimulus program which, all you had to do is look at what was in it, and you could see it was a payoff program – not a stimulus program," said Giuliani. The former New York City mayor claimed the economic stimulus package "was a pay-off to Democratic politicians and the Democratic unions."
Some Crist allies charge that Giuliani is now supporting Rubio – because Crist backed Sen. John McCain, R-Arizona, in the 2008 presidential election. But Giuliani denied there is any truth to that claim.
"It's my belief that Marco Rubio would best represent what I think the Republican Party should be doing, which is stopping the Obama administration from moving us too far in the direction of a...European social democracy," Giuliani said.