Barack Obama's Oval Office letter to Donald Trump: Congratulations coupled with a pointed civics lesson

In the final minutes of his time in the Oval Office, just before he left for his successor’s inauguration, Barack Obama slipped a letter inside the top drawer of the Resolute Desk. In it he offered Donald Trump, the incoming President, his congratulations, a rather pointed guide to the American constitution and some words of advice. “Congratulations on a remarkable run,” he wrote, according to a copy of the letter obtained by CNN. “Millions have placed their hopes in you,