From left to right, top: former U.N. Ambassador Nikki Haley, former President Donald Trump, former New Jersey Gov. Chris Christie. From left to right, bottom: Florida Gov. Ron DeSantis, North Dakota Gov. Doug Burgum and Vivek Ramaswamy. Joe Raedle/Getty Images; Brandon Bell/Getty Images; Michael M. Santiago/Getty Images; Scott Olson/Getty Images; Justin Sullivan/Getty Images hide caption
Republican presidential candidates former New Jersey Gov. Chris Christie, former U.N. Ambassador Nikki Haley, Florida Gov. Ron DeSantis, Vivek Ramaswamy and South Carolina Sen. Tim Scott participate in the NBC News Republican Presidential Primary Debate at the Adrienne Arsht Center for the Performing Arts of Miami-Dade County on Thursday in Miami. Joe Raedle/Getty Images hide caption
Former New Jersey Gov. Chris Christie speaks at a town hall-style event at the New Hampshire Institute of Politics at Saint Anselm College on June 6, Manchester, N.H. Michael M. Santiago/Getty Images hide caption
Former New Jersey Gov. Chris Christie speaks at a town hall-style event at the New Hampshire Institute of Politics at Saint Anselm College on June 6, Manchester, N.H. Michael M. Santiago/Getty Images hide caption
Former President Donald Trump signs autographs at Trump National Golf Club on Aug. 13 in Bedminster, N.J. Mike Stobe/Getty Images hide caption
Chris Christie announced he was released from a N.J. hospital Saturday, a week after checking in for mild COVID-19 symptoms. The former New Jersey governor was one of several Republicans to test positive after attending a Sept. 26 event (pictured above) at the White House. Alex Brandon/AP hide caption
Former New Jersey Gov. Chris Christie's new book, Let Me Finish: Trump, the Kushners, Bannon, New Jersey, and the Power of In-Your-Face Politics details his history with New Jersey politics and thoughts on the Trump administration. Elias Williams for NPR hide caption
Former New Jersey Gov. Chris Christie attends the White House Correspondents' Association dinner at The Washington Hilton in Washington, D.C., on April 28, 2018. Cheriss May/NurPhoto via Getty Images hide caption
New Jersey Gov. Chris Christie has been deflecting criticism over the past week after he was photographed lounging on the beach amid a government shutdown that closed other public beaches. Mel Evans/AP hide caption
Members of Alpha Phi Omega handle the world's largest Texas flag before University of Texas football games. Like the flag, it's a big deal. Erich Schlegel/Getty Images hide caption
New Jersey Gov. Chris Christie and his wife, Mary Pat Christie, visited the White House this week, ahead of a court date related to lane closures on the George Washington Bridge. Evan Vucci/AP hide caption
Jared Kushner and his wife, Ivanka Trump, acknowledge the crowd at the New York Hilton Midtown in the early morning hours of Nov. 9 in New York City. Chip Somodevilla/Getty Images hide caption
Bill Baroni (right), New Jersey Gov. Chris Christie's former top appointee at the Port Authority of New York and New Jersey, arrives at federal court in Newark, N.J., on Friday. Baroni and Bridget Kelly were found guilty of scheming to use traffic jams to punish a Democratic mayor who didn't endorse Christie in 2013. Julio Cortez/AP hide caption
Republican presidential candidate Donald Trump will receive his first classified intelligence briefing on Wednesday. Michael Conroy/AP hide caption
Tiffany Trump, daughter of Donald Trump and Marla Maples, will speak Tuesday night at the Republican convention. She has not been a presence on the campaign trail. Paul Sancya/AP hide caption