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Republican presidential hopeful  Carly Fiorina speaks during the Republican presidential debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 16, 2015.  Republican presidential frontrunner Donald Trump stepped into a campaign hornet's nest as his rivals collectively turned their sights on the billionaire in the party's second debate of the 2016 presidential race.  AFP PHOTO / FREDERIC J. BROWN        (Photo credit should read FREDERIC J BROWN/AFP/Getty Images)  Republican presidential hopeful Donald Trump participates in the Republican Presidential Debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 16, 2015. Republican presidential frontrunner Donald Trump stepped into a campaign hornet's nest as his rivals collectively turned their sights on the billionaire in the party's second debate of the 2015.  AFP PHOTO / FREDERIC J. BROWN        (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)Republican presidential hopeful  Ben Carson speaks during the Republican presidential debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 16, 2015.  Republican presidential frontrunner Donald Trump stepped into a campaign hornet's nest as his rivals collectively turned their sights on the billionaire in the party's second debate of the 2016 presidential race.  AFP PHOTO / FREDERIC J. BROWN        (Photo credit should read FREDERIC J BROWN/AFP/Getty Images)Republican presidential hopefuls Donald Trump (L) and Jeb Bush participate in the Republican presidential debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 16, 2015.  Republican presidential frontrunner Donald Trump stepped into a campaign hornet's nest as his rivals collectively turned their sights on the billionaire in the party's second debate of the 2016 presidential race.  AFP PHOTO / FREDERIC J. BROWN        (Photo credit should read FREDERIC J BROWN/AFP/Getty Images)
Republican presidential hopeful  Carly Fiorina speaks during the Republican presidential debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 16, 2015.  Republican presidential frontrunner Donald Trump stepped into a campaign hornet's nest as his rivals collectively turned their sights on the billionaire in the party's second debate of the 2016 presidential race.  AFP PHOTO / FREDERIC J. BROWN        (Photo credit should read FREDERIC J BROWN/AFP/Getty Images)  Republican presidential hopeful Donald Trump participates in the Republican Presidential Debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 16, 2015. Republican presidential frontrunner Donald Trump stepped into a campaign hornet's nest as his rivals collectively turned their sights on the billionaire in the party's second debate of the 2015.  AFP PHOTO / FREDERIC J. BROWN        (Photo credit should read FREDERIC J. BROWN/AFP/Getty Images)Republican presidential hopeful  Ben Carson speaks during the Republican presidential debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 16, 2015.  Republican presidential frontrunner Donald Trump stepped into a campaign hornet's nest as his rivals collectively turned their sights on the billionaire in the party's second debate of the 2016 presidential race.  AFP PHOTO / FREDERIC J. BROWN        (Photo credit should read FREDERIC J BROWN/AFP/Getty Images)Republican presidential hopefuls Donald Trump (L) and Jeb Bush participate in the Republican presidential debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 16, 2015.  Republican presidential frontrunner Donald Trump stepped into a campaign hornet's nest as his rivals collectively turned their sights on the billionaire in the party's second debate of the 2016 presidential race.  AFP PHOTO / FREDERIC J. BROWN        (Photo credit should read FREDERIC J BROWN/AFP/Getty Images)

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Trump vs. Carson and Bush's campaign troubles

The 'Inside Politics' panel on Trump's attack on Carson and Bush's campaign downsizing that has put Jeb on the defensive.

Trump vs. Carson and Bush's campaign troubles

The 'Inside Politics' panel on Trump's attack on Carson and Bush's campaign downsizing that has put Jeb on the defensive.