Mayor Eric Adams belatedly fell in line with his party’s leaders, with the party leadership, throwing his support behind Kamala Harris as the Democratic presidential nominee — despite just hours prior seemingly bashing the vice president for her handling of the border.

“I’m looking forward to moving towards a convention, seeing the Vice President Harris becoming the nominee,” Hizzoner said on MSNBC’s “Morning Joe” Monday morning.

“You’re going to see the real VP Harris move up to the level of President Harris.”

But for all the mayor’s effusive praise Monday – over Harris’ leadership skills, focus on public safety and even how took over the US border issue for President Joe Biden – he sang a less enthusiastic tune the night before.

Adams that night refused to endorse Harris and seemingly took a shot at the VP over her efforts to address the root causes of migration from Central America.

“I’ve been frustrated with the national leadership,” Adams told CNN’s Erin Burnett. “Dealing with immigration reform is something that we have failed at for years, even prior to this administration. That was very clear. We needed one person, a czar, [to] deal with the influx of migrants that were coming to our country who were paroled in.”

President Joe Biden tapped Harris in 2021 to oversee the administration’s diplomatic efforts in El Salvador, Guatemala and Honduras to tamp down on the flow of migrants at the southern border and create a long-term strategy for the country.

Since then, the number of border crossings has hit historic highs, with more than 200,000 asylum seekers pouring into the Big Apple for refuge.

The influx frustrated Adams, who vocally bashed the White House over immigration – and even singled out Harris in 2023, suggesting that the veep had “too much in her portfolio” to help the Big Apple with the migrant crisis.

After Biden dropped out of the presidential race Sunday, Adams pointedly dodged repeated questions over whether he’d endorse Harris.

What to know about President Biden's decision to drop out of the 2024 presidential race:

• President Biden announced Sunday he is dropping out of the 2024 presidential race — after weeks of prominent Democrats and donors calling on him to withdraw following his disastrous performance in the first presidential debate.
• In a letter posted on X Sunday afternoon, Biden admitted that it is in the “best interest of my party and country” for him to step down as the Democratic nominee.
• Biden wrote that he intends to serve out the remainder of his term and will address the country on his decision later this week.
• In a follow-up X post, Biden endorsed Vice President Kamala Harris for the suddenly open Democratic nomination. “Today I want to offer my full support and endorsement for Kamala to be the nominee of our party this year,” the president wrote.
• Former President Donald Trump reacted to the news by labeling Biden the “worst president in the history of our country” in a call with CNN.

“There’s a process and we’re going to follow that process,” he said Sunday when asked again if he’d endorse Harris.

But by Monday, after the mayor reportedly chatted with party leaders in New York, he swapped subtle digs for full-throated praise – first on MSNBC, then in a thread on X.

“I have spoken with a large number of state and city leaders, and all are agreed that Vice President Harris will deliver for New York,” he shared. “Now is the time for party unity and a platform that delivers a safer, more affordable future that brings the nation together against a dangerous Republican agenda.”

Adams’ day-later Harris endorsement looked to be a dollar short when compared to other New York City Democrats.

Adrienne Adams, the City Council’s speaker and a no-relation frenemy to the mayor, got behind Harris a few short hours after Biden’s bombshell dropout announcement.

“In Vice President Harris, we have a strong leader with a positive vision who deserves widespread support to defeat Trump and his destructive agenda at the ballot box,” she said in a statement Sunday.

Another frequent foil to Eric Adams – city Comptroller Brad Lander, who is eyeing a mayoral run – also speedily threw support behind Harris.

“Just made my first donation to her,” he tweeted Sunday.

“Time for us to roll up our sleeves and do everything we possibly can to make sure she — and House & Senate Democratic candidates — win this fall.”