Among the risks, say current and former intelligence officials and independent experts, are that top advisers could feed the incoming president a distorted view of global threats based on what they believe will please him and that foreign allies may be reluctant to share vital information.

Tulsi Gabbard - a former Democratic congresswoman who joined the Republican Party to back Donald Trump - is the president-elect's pick for director of national intelligence. The wide-ranging role would mean she oversees US intelligence agencies like the CIA, FBI and the National Security Agency (NSA), which focuses on intelligence gathering.

Hawaii, has been picked by President-elect Donald Trump to oversee the U.S. intelligence community. While Trump had long been expected to pick an "outsider" for the role of national intelligence director,