Republicans have for a long time objected to the strident refusal of Democrat politicians to admit the role of Islam in the global war on terror. According to President Obama and Democrat Hillary Clinton, among other leftists squarely in denial, Islam has nothing whatsoever to do with terrorism, and, as a result, the US is not at war with Islam.
Merely denying who the obvious enemy is during a time of war is bad enough, certainly worthy of condemnation as an act of sedition.