Thomson ReutersWASHINGTON (Reuters) - Sixteen U.S. Democratic lawmakers on Wednesday urged hearings be held in Congress on federal conflict-of-interest rules and Republican President-elect Donald Trump's business empire, though Republicans were unlikely to agree to it.House of Representatives Judiciary Committee Democrats asked its Republican chairman, Bob Goodlatte, who controls its agenda, "to examine federal conflicts of interest and ethics provisions that may apply to the President of the United States."The Democrats' letter to Goodlatte followed Trump's vow on Wednesday to step back from running his business to avoid conflicts of interest, as concern over his dual roles mounts ahead of the Republican's inauguration on Jan.