The Wall Street Journal reports that White House officials pushed Atlanta’s top federal prosecutor to resign before Georgia’s Senate runoffs because President Donald Trump was upset that he wasn’t doing enough to investigate unproven claims of election fraud. 

Citing people familiar with the matter, the report said that a senior Justice Department official, at the behest of the White House, called the Trump-appointed U.S. Attorney Byung J. Pak on the night of January 3. In that call the official reportedly said President Trump was furious there was no investigation related to election fraud and that he wanted to fire Mr. Pak.

The Journal said Pak resigned abruptly on Monday, a day after the phone call, saying in an early morning email to colleagues that his departure was due to “unforeseen circumstances.”

According to people familiar with his plans, he had a job lined up in the private sector, planned to leave by the end of the administration and already had drafted a resignation letter.

One source said Pak had already considered leaving early after the public release of a call between Trump and Georgia’s Secretary of State Brad Raffensperger, in which the president pushed the official to overturn the November election results.

But the source said when Park communicated that intent during the phone call on January 3, the White House indicated he should leave immediately.

The Korean-American assumed the four-year post of U.S. Attorney for the Northern District of Georgia in October 2017. 

The Wall Street Journal said the pressure for his resignation is part of Trump's broader push to overturn the state’s election results.