Donald Trump is expected to tap U.S. Senator Marco Rubio to be his secretary of state, sources said, putting the Florida-born politician on track to be the first Latino to serve as America’s top diplomat once the Republican president-elect takes office in January, writes Reuters.

Rubio was arguably the most hawkish option on Trump’s shortlist for secretary of state, and he has in past years advocated for a muscular foreign policy with respect to America’s geopolitical foes, including China, Iran, Cuba. Over the last years he has softened some of his stances to align more closely with Trump’s views. The president-elect accuses past U.S. presidents of leading America into costly and futile wars and has pushed for a more restrained foreign policy.

While the famously mercurial Trump could always change his mind at the last minute, he appeared to have settled on his pick as of Monday, according to the sources, who requested anonymity to discuss private conversations.

Representatives for Trump and Rubio did not immediately respond to requests for comment.

The new administration will confront a world more volatile and dangerous than it was when Trump took office in 2017, with wars raging in Ukraine and the Middle East and China aligning itself more closely with U.S. foes Russia and Iran.

The Ukraine crisis will be high on Rubio’s agenda. Rubio, 53, has said in recent interviews that Ukraine needs to seek a negotiated settlement with Russia rather than focus on regaining all territory that Russia has taken in the last decade. He was also one of 15 Republican senators to vote against a USD 95 billion military aid package for Ukraine, passed in April.