Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE is slated to deliver a speech lambasting Hillary Clinton Hillary Diane Rodham ClintonJeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Momentum growing among Republicans for Supreme Court vote before Election Day Warning signs flash for Lindsey Graham in South Carolina MORE on Wednesday morning in what could be a pivotal moment of the general election campaign.

Trump will deliver a speech at Trump SoHo New York Hotel "regarding the election," his campaign announced Tuesday morning in a cryptic press release that provided no other details.

I will be making a big speech tomorrow to discuss the failed policies and bad judgment of Crooked Hillary Clinton. — Donald J. Trump (@realDonaldTrump) June 21, 2016 Trump tweeted minutes later that the address will lay out his case against his Democratic opponent:

Trump had planned a speech attacking the former secretary of State for earlier this month, but postponed it after the nation suffered its deadliest mass shooting in Orlando last weekend.

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The outspoken businessman sparked a fresh round of criticism from members of his own party earlier this month when he went after a federal judge's Mexican heritage.

Clinton, the presumptive Democratic nominee, ripped into him as "temperamentally unfit" for the White House in a major speech this month and blasted his response to the mass shooting in Orlando.

On Monday, Trump's team announced it was parting ways with his campaign manager, Corey Lewandowski, after months of reported intra-campaign tension.

Trump's polling numbers have slipped, with a series of recent national surveys showing Clinton with a single-digit lead while she's also begun a massive ad blitz.

Trump on Tuesday made an appeal to GOP leaders to support his campaign after a paltry May fundraising report that showed him with just $1.3 million in the bank, tens of millions of dollars behind Clinton

"It would be nice to have full support from people that are in office, full verbal support," Trump said on Fox. "With all of that being said, I may go a different route if things don't happen."

Trump's speech Wednesday comes a month before the Republican National Convention in Cleveland, where he is slated to officially be declared his party's nominee.