The biggest hot button may be the travel ban executive orders, which various polls have found close to half of the respondents in favor of (depending on the poll, support was higher or lower than opposition – support ranged from 42% to 52% according to http://www.huffingtonpost.com/entry/polls-trump-executive-order-travel-ban_us_589479a4e4b0c1284f255570 ). With that much support, support for the travel ban executive orders is presumably within the “mainstream” somewhere (presumably among conservatives).