‘X-Men: Days of Future Past’ Features Nixon, Vietnam

Bryan Singer teases Tricky Dick's role

To the distress of history teachers, the Cuban Missile Crisis was a pivotal plot point in "X-Men: First Class," which brought suprpowered mutants into the historic standoff.

Another painful chapter in American history will apparently be part of the next "X-Men" film:  Based on photos director Bryan Singer tweeted Tuesday, it would appear that President Richard Nixon and the Vietnam War will be referenced in the upcoming superhero film.

Singer, who has used his Twitter feed to tease casting and set photos throughout production, shared shots of a crowd of flag-wavers with the message "GOOD MORNING VIETNAM!!!" along with another image of Nixon in an Oval Office confab. The Nixon discussion was described by Singer as "a pivotal meeting."

"X-Men: Days of Future Past" hits theaters on July 18, 2014.