WASHINGTON (NBC NEWS) — Kentucky Democratic Senate candidate Amy McGrath raised more than $2.5 million in the first 24 hours of her campaign against Mitch McConnell — over $1 million of it coming in just the first five and a half hours after she announced, according to her campaign.

McGrath campaign manager Mark Nickolas said it’s the most ever raised in the first 24 hours of a Senate campaign. The Democratic Senatorial Campaign Committee says the next closest was former NASA astronaut Mark Kelly, who raised $1 million in his first day of his campaign in Arizona.

The haul is a sign of just how deep Democratic antipathy toward McConnell, the Senate majority leader, runs in the Trump era.

All of the $2.5 million came in online donations with an average donation of $36.15, her campaign manager said. The $2.5 million total doesn’t include any additional traditional fundraising money that may have been raised in the form of checks or promised campaign contributions.

McGrath’s race against McConnell promises to be one of the most expensive Senate races of the 2020 election cycle. McConnell, as the Senate majority leader, has a formidable fundraising machine — in 2014, he raised and spent over $30 million in his race against Democrat Alison Lundergan Grimes.