Kelly was initially touted for his military background and seen as a force of order and calm in a chaotic White House plagued by a high turnover rate.
Almost a month after Porter's resignation, Kelly admitted that he mishandled his response to the allegations against Porter.
In the two weeks leading up to Trump's disruptive swing through Europe, senior aides predicted that Kelly had days or hours left.
Spy agencies suspect North Korea building new missiles
But many experts say those are neither irrevocable nor serious steps that could show the country is honest about denuclearization. There were estimated 5,300 Americans who did not return home from the conflict.
A White House official confirmed the report to Breitbart News.
Kelly was appointed last July to succeed Reince Priebus, Trump's first chief of staff, after serving for the first six months of the administration as secretary of homeland security.
'My eyes are burning': Tour chaos as riders hit by tear gas
Less than 30 kilometers into the stage, a protest by French farmers brought to the riders to a halt after bales of hay were thrown onto the road.
Trump has reportedly considered replacing Kelly, with whom he's clashed over management style.
Kelly is telling staffers that he had agreed to stay on. A Fox News interview in which Kelly suggested that Trump's thinking on his signature border wall was evolving was an early flash point, followed by the fallout from the Porter controversy.
Trump to Provide $12 Billion in Aid to Farmers. Critics Cry ‘Welfare!’
The Agriculture Department is announcing a $12 billion "short-term" plan to help US farmers hurt by retaliatory tariffs. As for how farmers can apply for assistance, those details are still being worked out.
Kelly has often joked publicly about how working for Trump is the hardest job he's ever had, including those on the battlefield. As a chief with no background in politics, he'll likely be responsible for running White House operations while Trump focuses on his re-election campaign. He has said he spends as much as eight hours a day with Trump.