Trump transition live updates: Trump announces pick for energy secretary

Trump is expected to soon announce he has chosen South Dakota Gov. Kristi Noem as his next secretary for the Department of Homeland Security, according to sources.

The role requires Senate confirmation.

Noem was on the short-list to be Trump's running mate, but her chances dimmed as she fended off controversy over accounts in her book about killing her dog that she claimed was showing aggressive behavior.

She also faced backlash after her spokesperson said a claim she made about meeting North Korean leader Kim Jong Un and an account of an interaction with former U.N. Ambassador Nikki Haley were "errors."

She is a loyal Trump ally who will work closely with Trump's new border czar Tom Homan and new deputy chief of staff for policy, Stephen Miller. CNN was first to report the news of Noem as the secretary pick.

-ABC News' Jonathan Karl. Rachel Scott, Katherine Faulders and Luke Barr

To replace Florida Rep. Mike Waltz in the U.S. House following his selection to serve as Trump's national security adviser, state statute requires Gov. Ron DeSantis to call for a special primary and then a special election in Florida.

The special elections to fill the House seat differ from Florida's way of filling Senate seats. State law mandates that DeSantis appoint an individual to fill any Senate vacancy.

Waltz currently represents Florida's solidly red 6th Congressional District, one that hasn't been represented by a Democrat since 1989. DeSantis himself was the congressmember for the northeastern Florida seat ahead of Waltz.

ABC News has not yet reported a projection for who will have control of the House, but Waltz's impending vacancy could impact Republicans' numbers as they head toward a GOP "trifecta" in Washington.

-ABC News' Isabella Murray

Trump announced he has nominated former Arkansas Gov. Mike Huckabee to be the U.S. ambassador to Israel.

"Mike has been a great public servant, Governor, and Leader in Faith for many years," Trump said in a statement. "He loves Israel, and the people of Israel, and likewise, the people of Israel love him. Mike will work tirelessly to bring about Peace in the Middle East!"

The role, which will need to be confirmed by the Senate, will be a key appointment as tensions remain high in the Middle East.

Trump has officially announced his appointment of Florida Rep. Mike Waltz as his national security adviser.

The president-elect highlighted Waltz's military background in a statement on the appointment, noting that he is the first Green Beret to have been elected to Congress and served in the Army Special Forces for 27 years.

"Mike has been a strong champion of my America First Foreign Policy agenda, and will be a tremendous champion of our pursuit of Peace through Strength!" Trump said in a statement.

The national security adviser is appointed by the president without confirmation by the Senate.

-ABC News' Soo Rin Kim, Kelsey Walsh and Lalee Ibssa