Twenty-second Amendment to the United States Constitution
As worded, the primary focus of the 22nd Amendment is on limiting individuals twice elected to the presidency from being elected again. Due to this, several issues could be raised regarding the amendment's meaning and application, especially in relation to the 12th Amendment, ratified in 1804, which states, "But no person constitutionally ineligible to the office of President shall be eligible to that of Vice-President of the United States". While it is clear that under the 12th Amendment the original constitutional qualifications of age, citizenship, and residency apply to both the president and vice president, it is unclear whether someone who is ineligible to be elected president could be elected vice president. Because of this apparent ambiguity, there may be a loophole in the 22nd Amendment whereby a two-term former-president could be elected vice president and then succeed to the presidency as a result of the incumbent's death, resignation, or removal from office (or even succeed to the presidency from some other stated office in the presidential line of succession).
2020 United States presidential election
Beginning in August 2017, reports arose that members of the Republican Party were preparing a "shadow campaign" against Trump, particularly from the moderate or establishment wings of the party. Now late Arizona Senator John McCain said that "[Republicans] see weakness in this president." Maine Senator Susan Collins, Kentucky Senator Rand Paul, and former New Jersey Governor Chris Christie all expressed doubts in 2017 that Trump will be the 2020 nominee, with Collins stating "it's too difficult to say." Senator Jeff Flake claimed in 2017 that Trump is "inviting" a primary challenger by the way he is governing. Longtime political strategist Roger Stone, however, predicted in May 2018 that Trump may not seek a second term if he succeeds in keeping all of his campaign promises and "makes America great again".