FILE - In this March 26, 2021, file photo former Secretary of State Mike Pompeo speaks at the West Side Conservative Club in Urbandale, Iowa. Less than three months after former President Donald Trump left the White House, the race to succeed him is already beginning. Pompeo, has launched an aggressive schedule visiting states that will play a pivotal role in the 2024 Republican primaries and he has signed a contract with Fox News Channel. (AP Photo/Charlie Neibergall, File)

FILE - In this March 5, 2021, file photo protesters supporting former President Donald Trump march down Fifth Avenue on their way towards Times Square in New York. Trump ended his presidency with such a firm grip on Republican voters that party leaders fretted he would freeze the field of potential 2024 candidates, delaying preparations as he teased another run. Instead, many Republicans with national ambitions are openly laying the groundwork for campaigns as Trump continues to mull his own plans. (AP Photo/John Minchillo, File)

FILE - In this Jan. 20, 2021, file photo, former Vice President Mike Pence speaks after arriving back in his hometown of Columbus, Ind., as his wife Karen watches. Less than three months after former President Donald Trump left the White House, the race to succeed him is already beginning. Pence has started a political advocacy group, finalized a book deal and later this month in South Carolina will give his first speech since leaving office. (AP Photo/Michael Conroy, File)

Former South Carolina Gov. Nikki Haley speaks with reporters after a tour of the campus of South Carolina State University on Monday, April 12, 2021, in Orangeburg, S.C. Haley, often mentioned as a possible 2024 GOP presidential contender, said Monday that she would not seek her party's nomination if former President Donald Trump opts to run a second time. (AP Photo/Meg Kinnard)

Florida Gov. Ron DeSantis gestures during a news conference Sunday, April 4, 2021, at the Manatee County Emergency Management office in Palmetto, Fla. DeSantis has received a single-dose coronavirus vaccine. His office confirmed Wednesday, April 7, 2021 that the Republican governor got the Johnson & Johnson vaccine, which requires only a single dose. (AP Photo/Chris O'Meara, file)