UPDATE | Billionaire Donald Trump joins crowded GOP field for president

WASHINGTON (AP) — With a presidential field approaching 20 high-profile Republicans, the GOP's 2016 class offers voters a little bit of everything.

There is the top-tier, a group that includes former Florida Gov. Jeb Bush, who formally launched his candidacy on Monday. There are the single-issue candidates such as South Carolina Sen. Lindsey Graham, who talks about national security and little else. There are even the quixotic underdogs, such as Louisiana Gov. Bobby Jindal, ambitious against all odds.

And then there is Donald Trump.

The Donald, as he is known as a celebrity, announced his 2016 intention to run for president today at a Manhattan skyscraper that bears his name.

He is a businessman, a reality television star and a master of self-promotion. Trump is positioned to have a greater impact on the early months of the Republican presidential primary contest than many GOP leaders would like.

Based on guidelines recently announced by the television networks, Trump could play a prominent role in the upcoming nationally televised Republican debate in August.

Those who rank in the top 10 in national polls — and Trump currently does, although he's close to the bottom — will earn a place on the debate stage. That could place Trump in a debate alongside leading candidates such as Wisconsin Gov. Scott Walker, Florida Sen. Marco Rubio and Bush.