Michael Flynn replacements david petraeus keith kellogg bob harward intv es_00000527.jpg
Meet potential Flynn replacements
01:00 - Source: CNN

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Flynn retired in the face of mounting controversy

Here are some of his potential replacements

Washington CNN  — 

Michael Flynn tendered his resignation as national security adviser on Monday night, creating an opening in one of the most important positions in the White House.

President Donald Trump tapped retired Lt. Gen. Keith Kellogg to serve as acting national security adviser, elevating the man who served as the national security council’s chief of staff to the top role on a temporary basis.

Kellogg is in the running to hold the position full-time, as well as retired Gen. David Petraeus and former Vice Admiral Bob Harward, a source told CNN Monday evening.

But Harward is considered the top contender for the job, a senior official told CNN Tuesday.

Harward

Then-Navy Vice Admiral Robert S. Harward (right) attends the "Eager Lion" joint military exercise at the King Abdullah Special Operations Training Centre in Amman on May 27, 2012.

Harward grew up in Iran, where his father was a naval officer, and graduated from the Tehran American School.

Harward also joined the Navy, where he served in both East and West coast SEAL teams and took a tour in the White House. There, he worked with the National Security Council and during the Obama administration, served as deputy commander of US Central Command.

WASHINGTON, DC - JANUARY 22: Retired Lieutenant General Michael Flynn, U.S. national security advisor, arrives to a swearing in ceremony of White House senior staff in the East Room of the White House on January 22, 2017 in Washington, DC. Trump today mocked protesters who gathered for large demonstrations across the U.S. and the world on Saturday to signal discontent with his leadership, but later offered a more conciliatory tone, saying he recognized such marches as a "hallmark of our democracy." (Photo by Andrew Harrer-Pool/Getty Images)
Flynn: One of the greatest presidencies
02:57 - Source: CNN

Since retiring from the military, he has served as an executive in Lockheed Martin UAE.

Incidentally, emails made public as a result of a Washington Post FOIA request over the Petraeus resignation showed correspondence between Harward and the man who is now secretary of defense, then Gen. James Mattis. In the emails, Mattis is seen writing of Harward: “He’s brilliant (for a SEAL, smile).”

Kellogg

Retired Lt. Gen. Keith Kellogg speaks to the media in the lobby at Trump Tower, November 15, 2016 in New York City.

Like Flynn, Kellogg is a three star former lieutenant general in the Army who retired and went on to serve in the Trump administration. He worked directly under Flynn serving as the council’s chief of staff for less than a month before the controversy over Flynn’s contact with Russian ambassador Sergey Kislyak forced Flynn out of the job and Kellogg into acting leadership of the council.

Before joining the Trump administration, Kellogg served as a foreign policy adviser to Trump during the campaign.

Kellogg spent decades in the military and rose through the ranks before retiring at the outset of the Iraq War. He continued to work with the US government and within the national security arena, taking a leading role in the Coalition Provisional Authority – a group tasked with reorganizing the Iraqi government and military after its dissolution and reformation under President George W. Bush.

As more scrutiny draws on Kellogg, he is sure to face pushback for his roles in the private sector and the Iraq War.

Petraeus

Ret. General and former CIA Director, David Petraeus, arrives for meetings with President-elect Donald Trump on November 28, 2016 at Trump Tower in New York.

Also like Flynn, Petraeus is a former military man who served for years before a major rise and fall under President Barack Obama.

Petraeus was one of the key military figures to codify the US’ counterinsurgency approach to conflicts in the Middle East. He became hugely popular for spearheading the military surge in Iraq to curb heightened violence in the late 2000s.

At the time, the Bush administration and many throughout Washington dubbed the surge a success and Petraeus was applauded for it. Then when Gen. Stanley McChrystal was forced to resign after an earthshaking article from Michael Hastings, a now-deceased freelance journalist who was published in Rolling Stone, Obama tapped Petraeus to take over from McChrystal as the military leader in Afghanistan.

Petraeus led troops in Afghanistan before another major Obama administration switch-up resulted in Petraeus moving to lead the CIA.

In a stunning fall from grace, he resigned his position over an extramarital affair with his biographer. A Justice Department investigation accused Petraeus of sharing classified information with the woman whom he was having an affair with. He pleaded guilty and agreed to serve two years probation and pay $100,000 fine.

Trump reportedly considered him for secretary of state and the vice presidency, but ultimately offered him no role in the administration. If tapped to be national security adviser, he would still be under probation until April.

CNN’s Jim Acosta, Sara Murray, Gloria Borger and Kevin Liptak contributed to this report.

This story has been updated.