There is almost nothing in the words of the Constitution that even begins to support former President Donald J. Trump’s boldest defense against charges that he plotted to overturn the 2020 election: that he is absolutely immune from prosecution for actions he took while in office.

A federal appeals court will hear arguments on the question next week, and the panel will consider factors including history, precedent and the separation of powers. But, as the Supreme Court has acknowledged, the Constitution itself does not explicitly address the existence or scope of presidential immunity.

In his appellate brief, Mr. Trump said there was one constitutional provision that figured in the analysis, though his argument is a legal long shot. The provision, the impeachment judgment clause, says that officials impeached by the House and convicted by the Senate are still subject to criminal prosecution.

The provision says: “Judgment in cases of impeachment shall not extend further than to removal from office, and disqualification to hold and enjoy any office of honor, trust or profit under the United States: But the party convicted shall nevertheless be liable and subject to indictment, trial, judgment and punishment, according to law.”