It's a tradition for outgoing US presidents to welcome their successors with a letter. The handwritten letters, which are left in the Oval Office for the incoming president to find, often share advice and words of wisdom.
Former President Obama's letter to President Trump was no different.
"We are just temporary occupants of this office. That makes us guardians of those democratic institutions and traditions—like rule of law, separation of powers, equal protection, and civil liberties—that our forebears fought and bled for," Obama wrote. "Regardless of the push and pull of daily politics, it's up to us to leave those instruments of our democracy at least as strong as we found them ... And finally, take time, in the rush of events and responsibilities, for friends and family. They'll get you through the inevitable rough patches."
"Michelle and I wish you and Melania the very best as you embark on this great adventure, and know that we stand ready to help in any ways which we can," he continued. "Good luck and Godspeed."
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