Q&As on Hillary Clinton's latest State email release

WASHINGTON (AP) — The State Department will be delivering a New Year's Eve batch of more emails from Hillary Clinton's time as secretary of state, bringing 2015 to a close for the Democratic presidential front-runner.

Clinton has faced questions about whether her use of a private email server was sufficient to ensure the security of government information and retention of records.

Thursday's emails will be the second-to-last set of messages released to the public with the final segment expected just before the Iowa caucuses on Feb. 1.

Clinton contends that she never sent or received emails that were marked classified at the time but some emails on her server were later deemed top secret or included confidential or sensitive information.

The messages have shown how Obama's secretary of state dealt with a series of foreign policy hurdles, from the Arab Spring in the Middle East to the deadly 2012 attacks in Benghazi, Libya, and efforts to curb Iran's nuclear ambitions.

By court order, the State Department is required to release as many of her emails as they can in a single installment on the last weekday of every month.

The emails have been disseminated in increments that allow the department to review the emails and redact sensitive information.