The Republican presidential candidates are preparing for the first debate of the 2016 election season. Ten candidates will appear in a prime-time debate, while seven candidates who did not make the cut will participate in another debate in the afternoon. Fox News said it calculated its top 10 list by averaging five national polls, a process which came under fire from polling agencies earlier this week. The Marist Institute for Public Opinion temporarily suspended its polling, saying Fox’s criteria ignores the margin of error.