Trump warns of 'constitutional crisis' but term is vague

WASHINGTON (AP) — Republican presidential candidate Donald Trump is warning that electing rival Hillary Clinton could mire the country "in a constitutional crisis that we cannot afford."

Jim Jacobs, a professor of criminal law at New York University School of Law, noted that Bill Clinton faced a civil lawsuit for sexual harassment during his presidency that led to an impeachment proceeding.

Perhaps the nation's greatest constitutional crisis occurred during Watergate when President Richard Nixon refused to turn over White House audiotapes to Archibald Cox, a special prosecutor investigating the scandal.