Three prominent Republican figures are entering the 2016 US presidential race this week in the already crowded competition to win the party’s nomination.
Ben Carson, an African-American author and retired neurosurgeon, plans to formally announce that he will run for the White House at an event in Detroit on Monday.
Carson rose to prominence in 2013 with a speech criticizing President Barack Obama's health care initiative known as Obamacare, and equating the program to slavery.
Former Hewlett-Packard CEO Carly Fiorina will also announce her candidacy on Monday, though she has little experience in national politics and a failed attempt in the 2010 US Senate race.
She served as an economic adviser to Arizona Senator John McCain during the 2008 presidential race, which he lost to Obama.

Former Arkansas Governor Mike Huckabee, who unsuccessfully ran for the White House in 2008, also plans to join the race Tuesday.

The Republican Party's other presidential candidates include Senators Rand Paul, Marco Rubio and Ted Cruz. Former Florida Governor Jeb Bush and Wisconsin Governor Scott Walker are widely expected to run for president as well.
On the Democratic field, former Secretary of State Hillary Clinton and Vermont Senator Bernie Sanders are the only ones who have officially declare their candidacy.
The presidential election in US, held every four years, is essentially a race between a Democrat and a Republican who win their party's nomination, although candidates from smaller parties can also run.
The next president will take office in early 2017, when Obama's second term ends.
AHT/HRJ