Donald Trump cannot legally run for president again in 2028 because the 22nd Amendment to the U.S. Constitution prohibits any person from being elected president more than twice. Since Trump is currently serving his second term after being re-elected in 2024, a third term as president through a direct election is constitutionally barred.
There has been speculation and discussion around potential ways to bypass this limit, such as running as vice president and then assuming the presidency if the president resigns. However, this is legally uncertain and faces constitutional challenges, including provisions in the 12th Amendment that limit eligibility to be vice president for someone constitutionally ineligible to be president.
Additionally, efforts to amend the Constitution to allow a third term would require a very difficult process involving supermajorities in Congress and ratification by most states, which is currently unlikely.
In summary, under the current constitutional framework, Trump cannot run for a third presidential term in 2028, though some unconventional legal and political maneuvers have been suggested but remain untested and controversial.