India, Oct. 14 -- Kimberly Guilfoyle has threatened to undermine the President Donald Trump's family following her sudden exit as US ambassador to Greece, Daily Mail reported, citing sources familiar with the matter.

The White House announced Tuesday that Guilfoyle, 57, was requested to step down from her role as ambassador to Greece amid allegations that she intimidated diplomatic officials, granted lobbyists inappropriate access to sensitive information, and attempted to secure financial contributions in exchange for political influence.

However, the ex-attorney and Fox News commentator, who was once engaged to the President's oldest son, Donald Trump Jr., 48, shows no intention of stepping down without making her voice heard.

Accord...