"He knows Bob Mueller, he's very fond of the president, and I think this is a great thing for the president and more so the country - and I think that's one of the reasons Rudy's doing this", Kerik said.
Trump said in a statement that Giuliani "wants to get this matter quickly resolved".
Giuliani had a notable career as a federal prosecutor before he became mayor of NY in 1994, a position he held until 2001.
Giuliani met with Turkey's president, Recep Tayyip Erdogan, early previous year in an effort to resolve the charges against Zarrab.
Giuliani served as mayor of New York City from 1994 through 2001.
Giuliani, who is taking a leave from law firm Greenberg Traurig while he serves Trump, has some qualifications for the job besides his loyalty.
The former NY mayor has also represented Reza Zarrab, a Turkish-Iranian gold trader charged in the US for helping Iran skirt sanctions.
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"They've been saying I'm going to get rid of them for the last three months, four months, five months", Mr. Trump said.
A number of Trump allies have believed that Trump has been ill-served by his current legal team and applauded the addition of the hard-charging Giuliani.
At Wednesday's press conference, the president also downplayed the possibility of firing Deputy Attorney General Rod Rosenstein or Mr. Mueller, when asked by a reporter.
Trump's other lawyer Ty Cobb has taken the lead in dealing with Mueller's team.
"This is a really big deal that Rudy Giuliani is joining President Trump's team", Crokin concluded.
-After leaving office as mayor, Giuliani advised foreign political figures and worked for lobbying and security firms whose clients have had complicated relationships with the United States government.
"I don't know yet what's outstanding".
"They're not limelight people", said Zeldin, who overlapped with Jane Serene Raskin when they both worked at the Justice Department.
Although Trump has been angry over the Federal Bureau of Investigation raiding his personal attorney's office and hotel room - lashing out about Mueller and Deputy Attorney General Rod Rosenstein, who signed off the raid, in his tweets and comments to reporters in recent days - he appeared to be in a good mood in Key West, commenting on the large crowds that had assembled along the route.