For months, the 2016 Republican presidential field has mushroomed to include an almost-unheard-of 17 candidates. This week, the field could finally start to narrow The top 10 candidates based on national polling will gather in Cleveland on Thursday for the first prime time, nationally-televised debate of the campaign. In a public spectacle millions of Americans are likely to tune in to Fox News for, the 10 will lay out their cases, zing their opponents, fall prey to gaffes—and try to avoid getting sucked into The Donald Trump show. The seven candidates whose polling numbers are too minuscule for the main event will participate in an undercard event on Fox several hours earlier, playing to a much smaller audience.