Stevie Wonder and Reverend Jesse Jackson were among the stars to visit Franklin at her home in Detroit, Michigan, over the last few days.
Franklin canceled planned concerts earlier this year after she was ordered by her doctor to stay off the road and rest.
"Like people all around the world, Hillary and I are thinking about Aretha Franklin", Clinton said Monday on Twitter.
Aretha Franklin news Star performed at an event for the Elton John AIDS Foundation last year
Quinn, speaking on behalf of her family, told People: "The love she has for her family is above reproach and was evident in the warm smiles she was able to share with her nephew during his very brief visit two weeks ago. We believe she'll pull through it, she believes she will pull through it, and that's the important thing".
Another source told the news outlet that she has been battling cancer, a rumor that has existed for many years. According to the Detroit Free Press, the couple's opener, DJ Khaled, also played Franklin's hit "Respect", generating roars of applause from the audience. "And the last time I talked to her, she just said 'I'm not to be anxious about, and the church is not to be anxious about'". "I just knew I wanted to be like that!" He said he and his religious group held a prayer vigil outside the White House for Franklin in 2013, and she got better then.
Aretha never forgot Buffalo and would often talk call out Queen City street names that she remembered while performing on stage.
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