It was 53 years ago today that a joint session of Congress approved the Gulf of Tonkin Resolution, an act that led to the Vietnam War’s escalation and the eventual passage of another act seeking to curb presidential powers.

The apparent conflict between President Donald Trump and his Attorney General, Jeff Sessions, has led to speculation that Sessions could be leaving his position soon. Such an action would be unprecedented if Sessions were actually fired, but there have been several occasions where past Attorneys General left office under pressure.

After being impeached, President Andrew Johnson survived his 1868 Senate trial by just one vote. And to this day, how that vote was cast remains shrouded in controversy.

Writing in The Atlantic, National Constitution Center president and CEO Jeffrey Rosen explores various definitions of a constitutional crisis and how they help us understand President Trump's firing of the FBI director.

Josh Blackman of the South Texas College of Law in Houston and David Cole of the American Civil Liberties Union discuss what President Trump's firing of the FBI director means for our constitutional system.

The United States Navy actually has two birthdays—one in October, and one today. So what is the difference between the two days and why is it constitutionally important?

On this day in 1789, the First Congress under our current Constitution met in its first joint session in New York and undertook an important order of business: confirming George Washington’s election as President.

On this day in 1867, United States Secretary of State William Seward signed a deal acquiring Alaska, an agreement that was ridiculed by some as “Seward’s Folly” and opposed in the House.

General James Mattis received a waiver allowing him to take the job, despite his recent retirement. Is this good for democracy?

The president moved quickly out of the gate. Here's how he stacks up.