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Rudy Giuliani, former mayor of New York, arrives at Trump Tower in New York, U.S., on Tuesday, Nov. 22, 2016. President-elect Donald Trump vowed to start the U.S. withdrawal from the Trans-Pacific Partnership, institute a five-year ban on federal officials lobbying after leaving government, and cancel 'job-killing' regulations on energy production within his first 100 days in office. Photographer: Anthony Behar/Pool via Bloomberg

Rudy Giuliani, former mayor of New York, arrives at Trump Tower in New York, U.S., on Tuesday, Nov. 22, 2016. President-elect Donald Trump vowed to start the U.S. withdrawal from the Trans-Pacific Partnership, institute a five-year ban on federal officials lobbying after leaving government, and cancel 'job-killing' regulations on energy production within his first 100 days in office. Photographer: Anthony Behar/Pool via Bloomberg

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Mike Huckabee, former governor of Arkansas, gestures while arriving at Trump Tower in New York, U.S., on Friday, Nov. 18, 2016. Donald Trump on Friday selected Alabama Senator Jeff Sessions as his attorney general, elevating one of his earliest congressional backers and one of the most conservative U.S. lawmakers to serve as the nation's top law enforcement official. Photographer: John Taggart/Bloomberg via Getty Images

Mike Huckabee, former governor of Arkansas, gestures while arriving at Trump Tower in New York, U.S., on Friday, Nov. 18, 2016. Donald Trump on Friday selected Alabama Senator Jeff Sessions as his attorney general, elevating one of his earliest congressional backers and one of the most conservative U.S. lawmakers to serve as the nation's top law enforcement official. Photographer: John Taggart/Bloomberg via Getty Images

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Newt Gingrich, former speaker of the U.S. House of Representatives, center, smile while arriving at Trump Tower in New York, U.S., on Monday, Nov. 21, 2016. President-elect Donald Trump resumed meetings with potential candidates for his administration Monday in New York as his transition office announced additional liaison groups that will work with federal agencies ahead of his January inauguration. Photographer: Aude Guerrucci/Pool via Bloomberg

Newt Gingrich, former speaker of the U.S. House of Representatives, center, smile while arriving at Trump Tower in New York, U.S., on Monday, Nov. 21, 2016. President-elect Donald Trump resumed meetings with potential candidates for his administration Monday in New York as his transition office announced additional liaison groups that will work with federal agencies ahead of his January inauguration. Photographer: Aude Guerrucci/Pool via Bloomberg

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Rudy Giuliani, former mayor of New York, speaks during the Republican National Convention (RNC) in Cleveland, Ohio, U.S., on Monday, July 18, 2016. Republican factions trying to stop Donald Trump's nomination noisily disrupted a vote on party convention rules, displaying the fissures in the party on the first day of its national convention. Photographer: David Paul Morris/Bloomberg via Getty Images

Rudy Giuliani, former mayor of New York, speaks during the Republican National Convention (RNC) in Cleveland, Ohio, U.S., on Monday, July 18, 2016. Republican factions trying to stop Donald Trump's nomination noisily disrupted a vote on party convention rules, displaying the fissures in the party on  the first day of its national convention. Photographer: David Paul Morris/Bloomberg via Getty Images

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NEW YORK, NY - SEPTEMBER 11: Republican presidental nominee Donald Trump (C) and former New York City mayor Rudy Giuliani arrive at September 11 Commemoration Ceremony at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton and Donald Trump attended the September 11 Commemoration Ceremony. (Photo by Justin Sullivan/Getty Images)

NEW YORK, NY - SEPTEMBER 11:  Republican presidental nominee Donald Trump (C) and former New York City mayor Rudy Giuliani arrive at September 11 Commemoration Ceremony at the National September 11 Memorial & Museum on September 11, 2016 in New York City. Hillary Clinton and Donald Trump attended the September 11 Commemoration Ceremony. (Photo by Justin Sullivan/Getty Images)