U.S. Secretary of State Mike Pompeo has nearly doubled promotions of top American diplomats as he seeks to restore work relations with a staff alienated by his predecessor, Rex Tillerson.

Since taking over in April, Pompeo has lavished attention on diplomats demoralized by the former oil executive's distant management style, reluctance to consult in-house experts and inability to get personnel choices through President Donald Trump's White House.

The charm offensive by the former Republican lawmaker and CIA director includes resuming the hiring of diplomats' family members when posted abroad, cheerleading emails to staff about his travels and a push to replenish the top ranks of U.S. diplomacy, officials said.