President Donald Trump faces the challenge of convincing Republican senators, global investors, voters and even Elon Musk that he won't bury the federal government in debt with his multitrillion-dollar tax breaks package. The response so far from financial markets has been skeptical as Trump seems unable to trim deficits as promised. “There is a level of concern about the competence of Congress and this administration and that makes adding a whole bunch of money to the deficit riskier.”