According to telegraph.com, protesters outside of a lack community church in Detroit, Michigan charged at police officers as Donald Trump spoke inside about "building on the legacy of Abraham Lincoln." He visited the Great Faith Ministries International church, being greeted with a prayer shawl as he joined the others clapping and swaying. Here, he promised a "civil rights agenda of our time", but outside, 150 protesters were struggling against cops yelling "Dump Trump". Trump's support from black American's is very low, while 80% of Detroit is black, but he was invited to the service by a the church pastor, Wayne Jackson, who is a supporter.
http://www.telegraph.co.uk/news/2016/09/03/donald-trump-claims-ill-build-on-abraham-lincolns-legacy-as-he-v/