Donald Trump plans to nominate US senator Marco Rubio as secretary of state, making him the first Latino to serve in the role. Rubio has been considered the most assertive candidate on Trump's shortlist, aligning his foreign policy views with the president-elect's. The decision, made by Monday according to sources, comes as the incoming administration faces global challenges such as conflicts in Ukraine and the Middle East, and China's strengthening ties with Russia and Iran. Rubio has previously advocated for diplomatic solutions with Russia in Ukraine and maintains a firm stance against China and the Cuban government.