Attendees at the Republican National Convention waved signs demanding “mass deportation now,” echoing Donald Trump’s campaign pledge, but conservative commentator Charlie Sykes wondered how exactly that policy could be carried out. The former president’s signature political issue has been purging the U.S. of undocumented migrants, whom he derides as inherently dangerous and filthy, and he has vowed to expand and stiffen the draconian policies he implemented in his first term if re-elected to serve a second, which Sykes told MSNBC’s “Morning Joe” posed some horrifying questions. “In the past he…