President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE’s 2020 campaign manager on Tuesday fired back after Sen.-elect Mitt Romney Willard (Mitt) Mitt RomneyThe Memo: Warning signs flash for Trump on debates GOP votes to authorize subpoenas, depositions in Obama-era probe Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' MORE (R-Utah) wrote a searing op-ed criticizing the president's character.

In a tweet, Trump's 2020 campaign manager Brad Parscale invoked Romney’s failed 2012 presidential bid, accusing the incoming senator of lacking the ability "to save this nation."

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“The truth is @MittRomney lacked the ability to save this nation. @realDonaldTrump has saved it,” Parscale wrote on Twitter. “Jealously is a drink best served warm and Romney just proved it. So sad, I wish everyone had the courage @realDonaldTrump had.”

The truth is @MittRomney lacked the ability to save this nation. @realDonaldTrump has saved it. Jealously is a drink best served warm and Romney just proved it. So sad, I wish everyone had the courage @realDonaldTrump had. https://t.co/mbxoTqbSX6 — Brad Parscale (@parscale) January 1, 2019

Parscale’s reaction came shortly after Romney penned a Washington Post op-ed slamming Trump’s character and his time in office.

"With the nation so divided, resentful and angry, presidential leadership in qualities of character is indispensable. And it is in this province where the incumbent’s shortfall has been most glaring," Romney wrote.

Romney, who was the 2012 Republican presidential nominee, spoke out against Trump during the 2016 election.

“It is well known that Donald Trump was not my choice for the Republican presidential nomination,” Romney wrote. “After he became the nominee, I hoped his campaign would refrain from resentment and name-calling. It did not. When he won the election, I hoped he would rise to the occasion.”

After two years in office, Romney wrote that Trump had not “risen to the mantle of the office.”

Romney’s remarks came two days before he will be sworn into Senate on Thursday.

“I do not intend to comment on every tweet or fault,” he wrote. “But I will speak out against significant statements or actions that are divisive, racist, sexist, anti-immigrant, dishonest or destructive to democratic institutions.”