Who while in office was the last U.S. President to wear a full beard from ear to ear?

Benjamin Harrison, who was the 23rd President of the United States (1889-1893), was the last U.S. President who while in office to wear a full beard from ear to ear.

Also, it is interesting to note that over the last hundred-year period (1913-2016) no incumbent U.S. president has had a beard or mustache during their election campaign.

Today, it is generally held that a beard or a mustache reduces the likelihood of winning an American presidential election. According to U.S. historical facts, Charles Evans Hughes, who was defeated in the 1916 presidential election was the last major party candidate (Republican) to wear a full beard while running for the office of U.S. president.