The Signal app uses end-to-end encryption.
The campaign is selling a T-shirt that says "LGBTQ for Trump."
The singer and actress will appear with Clinton next month in New York.
He argued that Donald Trump’s business dealings are more worrisome.
He called the interview "one of the most appalling things I have ever seen on television."
“He meets the clinical definition,” David Plouffe said.
He dismissed criticism over a tweet referring to the death of Dwyane Wade's cousin.
He also criticized the Democratic Party.
“His position is going to be tough. His position is going to be fair."