President-elect Donald Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE argued Tuesday that President Obama did not help Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE win key swing states in the presidential election.

In a tweet, Trump doubled-down on his belief that he would have defeated Obama in a head-to-head matchup after the president suggested he could have beat Trump.

President Obama campaigned hard (and personally) in the very important swing states, and lost.The voters wanted to MAKE AMERICA GREAT AGAIN! — Donald J. Trump (@realDonaldTrump) December 27, 2016

Trump’s tweet Tuesday came as the lobby of Trump Tower in New York City was briefly evacuated due to a suspicious package, which turned out to be a bag with children's toys.

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The president-elect is spending the holidays at his Mar-a-Lago resort in Palm Beach, Fla., and was not at his Manhattan high rise during the brief evacuation.

They are literally evacuating Trump Tower right now. https://t.co/I7Wm4ATbb0 — Dave Itzkoff (@ditzkoff) December 27, 2016

Trump Tower is being evacuated right now in New York. https://t.co/6BYTb04OAh — Kyle Griffin (@kylegriffin1) December 27, 2016

PEOTUS has other things on his mind amid Trump Tower evacuation https://t.co/9w8HhSNrpl — Jonathan Lemire (@JonLemire) December 27, 2016

Trump and Obama have mostly shied away from directly criticizing each other since last month's election, but Trump fired back after Obama argued he could have won a third White House term if allowed.

“You know, I’m confident in this vision because I’m confident that if I — if I had run again and articulated it, I think I could’ve mobilized a majority of the American people to rally behind it,” Obama said in an interview with David Axelrod, his former senior adviser and campaign strategist.

Obama was defending his vision of “one America,” a philosophy he laid out during a high-profile appearance at the 2004 Democratic National Convention in Boston.

Trump on Monday responded by insisting he could defeat Obama in a head-to-head election matchup.

“President Obama said that he thinks he would have won against me,” Trump tweeted. "He should say that, but I say NO WAY! — jobs leaving, ISIS, [ObamaCare], etc.”

Obama campaigned extensively for Clinton before her loss to Trump last month.

Trump received 304 Electoral College votes compared to Clinton's 227, though Clinton won the popular vote by a margin of nearly 3 million.

Trump's win was driven in part by victories in traditionally blue states such as Michigan, Pennsylvania and Wisconsin.