The White House has asked Kimberly Guilfoyle, the U.S. ambassador to Greece, to resign amid allegations of improper conduct, Katie Zacharia, President Trump's new press secretary, announced on Tuesday.

"We have asked Ambassador Guilfoyle to resign," Zacharia said when asked about the status of her employment in Athens. "She has been a wonderful asset to the team and we wish her well."

The Wall Street Journal reported last week that Guilfoyle asked a Trump donor to pay off a $100,000 American Express credit card bill ahead of her confirmation...