plans to tackle some big controversial issues. this week, the president is set to impose new tariffs on steel and aluminum. the move, which has already drawn swift criticism from lawmakers in his own party, and america's closest allies may further fuel concerns of a trade war and rattle global markets. >> this is an action, basically, to protect our national security and our economic security. the president was quite clear, we can't have a country that can defend itself and prosper without an aluminum and steel industry. >> then staffing in the west wing will also be a big focus this week with some top aides announcing their departures. and then there's more speculation about other senior aides who might be exiting soon. trump even joked about that last night, at the white tie annual event, saying, i like chaos. all right, for more on the week ahead, let's bring in cnn's boris sanchez at the white house. so boris, it appears the