Former Obama White House chief of staff Denis McDonoughDenis Richard McDonoughSusan Rice calls for Flynn-Kislyak transcripts to be released GOP seeks to go on offense using Flynn against Biden Tucker Carlson: Flynn case was domestic spying operation ‘hidden under the pretext of national security’ MORE endorsed former Vice President Joe BidenJoe BidenHillicon Valley: Biden calls on Facebook to change political speech rules | Dems demand hearings after Georgia election chaos | Microsoft stops selling facial recognition tech to police Trump finalizing executive order calling on police to use ‘force with compassion’ The Hill’s Campaign Report: Biden campaign goes on offensive against Facebook MORE’s White House Bid in an op-ed on Super Tuesday.

McDonough’s opinion piece in the St. Paul Pioneer Press on Tuesday said he worked “closely” with Biden throughout former President Obama’s tenure, and that he would be an “excellent president.”

“In what he did — and importantly how he did it — he demonstrated not just why the president trusted him to take on tough assignments but why he will be an excellent president,” he wrote. 

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McDonough said the former vice president “routinely took the hardest assignments,” writing that Biden oversaw how billions of dollars in stimulus funding was spent, got the Senate to ratify the New START arms control treaty with Russia, led efforts to improve gun background checks and promoted cancer prevention, prompting the 21st Century Cures Act in 2016.

“In his decision-making he’s always open to new ideas, not driven by ideology but by results, science and data,” he wrote. “On national security he seeks out the opinions of experienced military, diplomatic and intelligence professionals, trusting their experience and welcoming their input even — or maybe especially — when they disagree.”

McDonough, who also served as a deputy national security adviser, said Biden is “the kind of president the United States needs now.”

“It is this decision-making and thought process — on the hardest issues and in the most high-pressure situations — that lead the people who work most closely with Vice President Biden to value him and his leadership most strongly,” he wrote.

The op-ed comes as Biden competes for more than a third of the delegates in the 2020 primary in 14 states and American Samoa on Super Tuesday. The former Delaware senator currently sits in second place in the Democratic field at 54 delegates, following a rough start in Iowa and New Hampshire.

But Biden won big in South Carolina, leading his moderate competitors former South Bend, Ind., Mayor Pete ButtigiegPete ButtigiegScaled-back Pride Month poses challenges for fundraising, outreach Biden hopes to pick VP by Aug. 1 It’s as if a Trump operative infiltrated the Democratic primary process MORE and Sen. Amy KlobucharAmy KlobucharHillicon Valley: Biden calls on Facebook to change political speech rules | Dems demand hearings after Georgia election chaos | Microsoft stops selling facial recognition tech to police Democrats demand Republican leaders examine election challenges after Georgia voting chaos Harris grapples with defund the police movement amid veep talk MORE (D-Minn.) to drop out of the race and endorse him on Monday.

Meanwhile, self-described democratic socialist Sen. Bernie SandersBernie SandersThe Hill’s 12:30 Report: Milley apologizes for church photo-op Harris grapples with defund the police movement amid veep talk Biden courts younger voters — who have been a weakness MORE (I-Vt.) had a strong start to the primary season, nabbing the popular vote in Iowa and the most delegates in New Hampshire and Nevada. He sits in the lead at 60 delegates before the Super Tuesday votes come in.