Rep. Tulsi Gabbard Tulsi GabbardRepublicans call on DOJ to investigate Netflix over 'Cuties' film Hispanic Caucus campaign arm endorses slate of non-Hispanic candidates Gabbard says she 'was not invited to participate in any way' in Democratic convention MORE (D-Hawaii) tweeted Monday that when she met with Sen. Bernie Sanders Bernie SandersSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Schumer, Sanders call for Senate panel to address election security MORE (I-Vt.) before announcing her presidential campaign, he “showed me the greatest respect.”

“We had a nice one-on-one conversation and I informed him that I would be running for President,” she tweeted. “In that meeting, he showed me the greatest respect and encouragement, just as he always has.”

The tweet came amid ratcheting tensions between Sanders’s and Democratic Sen. Elizabeth Warren Elizabeth WarrenNo new taxes for the ultra rich — fix bad tax policy instead Democrats back away from quick reversal of Trump tax cuts It's time for newspapers to stop endorsing presidential candidates MORE’s (Mass.) presidential campaigns.

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Earlier this week, a CNN story broke citing four anonymous sources close to Warren that alleged that during a private meeting between Sanders and Warren in December 2018, Sanders told his progressive colleague that a woman could not be elected president.

Sanders has vehemently denied that he made the statement.

However, late Monday, Warren responded to the news in a statement saying, “I thought a woman could win; he [Sanders] disagreed.” Warren continued, saying that she did not want to discuss what took place at the meeting any further.

The clash followed a report over the weekend that the Sanders campaign was telling its volunteers to turn potential voters against Warren, saying that she is a weak candidate because she only appeals to wealthy, educated liberals.

The recent exchange between the two progressive candidates underscored a marked change in tone after months of the two avoiding criticizing the other’s campaign. Heat between the New England lawmakers has also intensified just before a critical Democratic debate in Iowa Tuesday.

Gabbard has not qualified for Tuesday night’s debate, polling at less than 3 percent nationally. The candidate also closed her fourth quarter fundraising totals at $3.4 million ahead of the new year, putting her significantly behind Democratic front-runners Sanders, Warren and former Vice President Joe Biden Joe BidenThe Memo: Warning signs flash for Trump on debates Senate Republicans signal openness to working with Biden National postal mail handlers union endorses Biden MORE (D).