President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE mocked Sen. Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.) less than an hour after she dropped out of the Democratic presidential primary race.

“A sad day for the Democrats, Kirsten Gillibrand has dropped out of the Presidential Primary. I’m glad they never found out that she was the one I was really afraid of!,” Trump tweeted Wednesday.

A sad day for the Democrats, Kirsten Gillibrand has dropped out of the Presidential Primary. I’m glad they never found out that she was the one I was really afraid of! — Donald J. Trump (@realDonaldTrump) August 28, 2019

Trump's remarks came shortly after Gillibrand announced she was ending her campaign, leaving the field with 20 candidates. ADVERTISEMENT

Gillibrand's decision also came hours before the deadline to qualify for the September primary debate. The New York Democrat had not met the criteria to appear on next month's debate stage.

“I know this isn't the result we wanted. We wanted to win this race," Gillibrand said in a video posted to Twitter. "But it's important to know when it's not your time and to know how you can best serve your community and country. I believe I can best serve by helping to unite us to beat Donald Trump in 2020.

Gillibrand, who has long advocated for victims of sexual assault, faced backlash over her past calls for former Sen. Al Franken Alan (Al) Stuart FrankenGOP Senate candidate says Trump, Republicans will surprise in Minnesota Peterson faces fight of his career in deep-red Minnesota district Getting tight — the psychology of cancel culture MORE (D-Minn.) to resign amid allegations of sexual misconduct. The New York senator similarly took on Trump, calling for his resignation over allegations of sexual assault.

Gillibrand, who centered her campaign on promoting policies she said would benefit women, ultimately failed to gain traction in the crowded field of 2020 contenders. She struggled during her campaign to poll consistently above 1 percent in most national and statewide surveys.

Some polls, meanwhile, have shown the primary race's front-runners — former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE and Sens. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.) and Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE (I-Vt.) — beating Trump in hypothetical 2020 match-ups.