WASHINGTON (AP) — Hillary Clinton spent the morning of her husband's impeachment visiting Capitol Hill to rally Democrats to his side. Pat Nixon kept assuring reporters her husband wouldn't quit — right up until he did. Eliza Johnson, frail from tuberculosis, kept watch over her husband during his impeachment while sitting in a room across from his White House office.

Melania Trump, just the fourth first lady forced to grapple with the threat of her husband's impeachment, is pressing on through the ordeal silently, showing no inclination to speak out publicly on behalf of her spouse.

While her...