Advisers to President Donald Trump are urging him to purge the government of former President Barack Obama's political appointees and quickly install more people who are loyal to him, amid a cascade of damaging stories that have put his nascent administration in seemingly constant crisis-control mode.

A number of his advisers believe Obama officials are behind the leaks and are seeking to undermine his presidency, with just the latest example coming from reports that Attorney General Jeff Sessions met twice last year with the Russian ambassador to the U.S. and apparently misled senators about the interactions during his confirmation hearing.