California Senate candidate Carly Fiorina (R) refused to take a position on immigration reform during her second debate with Sen. Barbara Boxer (D-Calif.).

"The drug war has reached California," Fiorina said during an exchange about border security and immigration. "We have a border that is insecure."

The debate was co-hosted by the Spanish-language newspaper La Opinion and Southern California Public Radio.

La Opinion's Gabriel Lerner pressed Fiorina on immigration reform.

"The reason I don't want to breeze past border security is we have not secured it," she told him. "We have to secure the border."

Lerner continued to push her for a position. "You have to deal with the most pressing problems in front of us," Fiorina said. "We need a temporary worker program that works in this state."

She added, "I am very proud that I have received the endorsement of so many in the Hispanic community and so many in the agricultural community."

Boxer made her position clear. "I believe in comprehensive immigration reform," the Democrat said. 

Fiorina was also pressed to name the "elite extreme environmental groups" she said were backing Boxer during their first debate earlier this month. 

Fiorina paused for several seconds before responding. She didn't name the groups, but said Boxer must feel "beholden" to "a variety organizations" because she supported the Senate's cap and trade legislation.

"I'm proud to have the support of the Sierra Club, I'm proud to have the support of the League of Conservation Voters," Boxer said in response.

The radio debate took place with Boxer at NPR's studios in Washington and Fiorina in KPCC's Pasadena studios. The two also engaged on issues such as abortion, gun control and the drug war in Mexico.

--Updated at 6:41 p.m.