Donald Trump is back at the White House after last week’s explosive confrontation with Ukrainian President Volodmyr Zelenskyy. The shocking exchange has raised questions about how much the U.S. will continue to support Ukraine as it looks for guarantees in a potential peace deal to end its conflict with Russia. And much of that is contingent on a Republican controlled Congress that Trump is set to address on Tuesday, March 4. Owen Fairclough has more.