At the start of this morning’s “Good Morning America,” Robin Roberts said she “slept like a baby last night for the first time since my diagnosis.” Roberts underwent her first pre-treatment procedure Monday for an eventual bone marrow transplant which will occur later this summer. Her sister is her donor.

“My family and I are comforted by the loving, tremendous response from everyone,” said Roberts.

George Stephanopoulos then read a Tweet from Michelle Obama:

.@RobinRoberts, Barack and I have you in our prayers. We believe in you and thank you for bringing awareness and hope to others. –mo

— Michelle Obama (@MichelleObama) June 11, 2012

Roberts also spoke with Ann Romney “who’s had her own challenges,” Roberts said. “It’s really been comforting,” said Roberts of the outpouring of support.