Round two for the Republicans is tonight... the second presidential debate will feature an extra podium in prime time.

FOX News Radio's Jared Halpern has a preview:

From America's Election Headquarters.

Tonight's main event at the Reagan Library in California will feature eleven top-tier candidates former Silicon Valley CEO Carly Fiorina added to the line-up.

(Fiorina) "I didn't get a phone call from Bill Clinton before I jumped in the race. Did any of you get a phone call from Bill Clinton?"

That shot at Donald Trump last month has set off a recent back and forth between Fiorina and the Republican front-runner.

(Trump) "You could call it bad luck, you could it she did a bad job, but Hewlitt-Packard was a disaster."

The debate could also renew ramped up sparring between Trump and former front-runner Jeb Bush.

(Bush) "There's one candidate in this, in the Republican party that is playing on people's angst and fears."

Trump has responded critical Bush speaks Spanish at campaign events and calling the former Florida Governor low-energy and boring.

Four back-of-the pack candidates will debate earlier... .Jim Gilmore excluded... failing to meet a polling threshold.

Jared Halpern, FOX News Radio.