The State Department will sharply restrict its commentary on the legitimacy of foreign elections to “rare” occasions, according to a new directive from Secretary of State Marco Rubio that continues the Trump administration’s turn away from promoting democracy abroad.

In an official cable to diplomatic and consular posts on Thursday, Mr. Rubio said that public comments on foreign elections “should be brief, focused on congratulating the winning candidate and, when appropriate, noting shared foreign policy interests.”

Such messages, the agency memo added, “should avoid opining on the fairness or integrity of an electoral process, its legitimacy, or the democratic values of the country in question.” The directive applied to the department’s domestic offices and foreign posts, Mr. Rubio said.

The New York Times obtained the text of the cable, which was reported earlier by The Wall Street Journal.

It has long been standard practice for the U.S. government to call out foreign elections tainted by fraud, intimidation and other tactics. Doing so puts pressure on corrupt or unethical governments, encourages democratic opposition movements and bolsters America’s moral standing, diplomats say.

Like it had done in previous administrations, the State Department under President Joseph R. Biden Jr. criticized foreign votes frequently, including what it called a “pantomime election” in Nicaragua, “election fraud” in Belarus and “democratic backsliding” after a disputed vote in the Republic of Georgia.