WASHINGTON (REUTERS)

U.S. Secretary of State Marco Rubio said on Tuesday that ending war in Ukraine would be official U.S. policy under President Donald Trump, part of the administration's goal of promoting peace.

Former U.S. Senator Rubio was the first of Trump's cabinet nominees to be sworn into office on Tuesday after the U.S. Senate unanimously confirmed his nomination on Monday evening. Additional votes on other Trump nominees were expected this week.

During his confirmation hearing last week, the new top U.S. diplomat said both Moscow and Kyiv would have to give concessions to end the war and suggested Ukraine would have to give up its goal of regaining all the territory Russia has taken in the last decade.

Rubio echoed those comments to NBC's "Today" show on Tuesday ahead of the swearing-in ceremony.

"It’s going to be the official policy of the United States that the war has to end and we’re going to do everything possible to bring that about," he said.