Presidential counselor and 2016 Trump campaign manager Kellyanne Conway Kellyanne Elizabeth ConwayGeorge and Kellyanne Conway honor Ginsburg Trump carries on with rally, unaware of Ginsburg's death George Conway hits Trump on 9/11 anniversary: 'The greatest threat to the safety and security of Americans' MORE knocked former Vice President Joe Biden Joe BidenMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE in a Washington Post op-ed on Thursday while touting Sen. Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE’s (I-Vt.) prospects in the Democratic presidential race.

Conway argued in the op-ed that Democratic “leaders and primary voters have been seduced into the trap of focusing on electability” when it comes to Biden, while maintaining that they should be turning to Sanders if concerned about electability.

"In fact, if Democrats were serious about electability, they’d nominate the guy who actually won primary contests and proved he can play David to Goliath in key places four short years ago," Conway wrote, referring to Sanders's 2016 presidential bid.

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The Trump aide went on to highlight Sanders's position near the top of primary polls and his fundraising hauls in the previous quarter, noting that he has "outlasted candidates who were media darlings and more in the mold of 'transformative' and 'historic.' "

Meanwhile, the White House official claimed that Democratic voters "are buying" Biden's assertion that he alone can beat Trump, while also downplaying the idea of "electability" in the 2020 race, arguing that "[c]andidate Trump showed that so-called electability is no match for electricity and a relentless focus on the electoral college."

Conway's op-ed, which Trump shared on Twitter on Thursday afternoon, comes after the president last week accused Democrats of seeking to undermine Sanders's chances of winning the party's presidential nomination by keeping him off the campaign trail for the Senate impeachment trial.

"They are rigging the election again against Bernie Sanders, just like last time, only even more obviously," Trump tweeted. "They are bringing him out of so important Iowa in order that, as a Senator, he sit through the Impeachment Hoax Trial."

They are rigging the election again against Bernie Sanders, just like last time, only even more obviously. They are bringing him out of so important Iowa in order that, as a Senator, he sit through the Impeachment Hoax Trial. Crazy Nancy thereby gives the strong edge to Sleepy... — Donald J. Trump (@realDonaldTrump) January 17, 2020

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Trump regularly weighs in on the Democratic White House race, offering his assessment for how candidates are faring as well as his predictions on who will win.

Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (Mass.) and several other Democrats have made the case that they are the candidate Trump most fears heading toward the November election.

Biden and Sanders have led most recent national polls.

The latest Monmouth University survey found Biden leading the Democratic field with 30 percent support, followed by Sanders at 23 percent and Warren at 14 percent, while a CNN poll released this week found Sanders edging past Biden 27 to 24 percent among Democrats and Democratic-leaning independents.