By Emily Stephenson and David Shepardson WASHINGTON (Reuters) - Chief executives of major U.S. companies huddled with President Donald Trump at the White House on Friday and some of them expressed concern about a travel ban on people from seven Muslim-majority countries traveling to the United States. Business leaders said afterward that the group, which included Jamie Dimon of JP Morgan Chase & Co and Indra Nooyi of PepsiCo Inc, discussed bank rules, tax reform, and objections to Trump's week-old ban.