Ahead of the U.S.-North Korean leaders second summit in Hanoi, there was perhaps no one who saw it more as a slam-dunk opportunity for peace than former U.S. basketball star and friend to leader Kim Jong Un than Dennis Rodman.

In an open letter to U.S. President Donald Trump posted to Twitter on Thursday, Rodman, a longtime confidant of Kim's, threw his support behind the second summit meeting. He encouraged Trump to use his strong relationship with Kim for the sake of the country's benefit.

"You are on the cusp of a big, beautiful deal," Rodman said in the open letter, calling himself an "ambassador of goodwill to North Korea."