WATCH: Top 5 most memorable moments in American State of the Union history

President Donald Trump will deliver his first official State of the Union address of his second term Tuesday night before a joint session of Congress at the Capitol, as viewers watch for viral moments and headline-grabbing exchanges like those that have defined past speeches.

Here are the top five moments from past State of the Union addresses.

It's become commonplace in recent years for presidents to acknowledge guests in the audience during SotU addresses, but President Ronald Reagan’s...