Despite slow, expensive and embarrassing efforts to renovate the historical Washington DC landmark, the US President said speaking at the site would "show how beautiful it is".
"We might hold it tomorrow or something," the president told reporters on Sunday.
The White House then formally announced he'd give a speech there on Monday afternoon, rather than continuing his campaign roadshow as his Republican Party tries to maintain control of Congress.
The 80-year-old cancelled weekend rallies on Thursday, opting instead for tele-rallies, with the Republican National Committee saying that would maximise his ability to speak to voters in nearly 20 states in a "72-hour sprint".
But there was a swift about-face, and he ended up rallying in the Republican-leaning "Farm Belt" states of Iowa then Kansas as originally planned.
Trump's month-long blitz has involved more than 25 rallies in largely conservative areas, as voters - including previous supporters - question the economic fallout of his decision to impose stiff tariffs and launch war in Iran.
Trump's Reflecting Pool saga began in April when he said he wanted to change its colour and would use contractors he knew to fix the monument in mere days.
The work was nearly three months behind schedule and the budget ballooned to more than 10 times his early estimate.
The pool was soon choked with algae blooms, its "American-flag blue" liner began peeling off in sections and it was quickly drained for new repairs in mid-July.
Trump has repeatedly blamed vandals and continued to do so on Sunday, despite the office of US Attorney for the District of Columbia — former Fox News host and longtime Trump ally Jeanine Pirro — previously putting the problems down to shoddy workmanship.
A particularly ignominious moment came when the Justice Department charged former Olympian David Hearn with intentionally damaging the Reflecting Pool — then abruptly dropped the case — determining he was not responsible.
A judge later permanently dismissed the charge.
Meanwhile, the Republicans have been handed an unexpected boost in Michigan - a key battleground state - with an endorsement from a prominent Democrat.
Haley Stevens, who lost Michigan Democrats' Senate primary to Abdul El-Sayed in a bitterly contested race, stunned party officials on Sunday by backing Republican Mike Rogers after attending a Detroit church service with him.
Stevens was scheduled to appear at a joint event with El-Sayed but was uninvited after calling on him to condemn an outside group's ad that she said blamed Israel for high grocery prices.
While Stevens has been critical of El-Sayed's comments around Israel, she recently reaffirmed she would vote for the former public health official, who would be the first US Muslim senator if elected on Tuesday.
Republicans hold a 53-47 Senate majority and a narrow edge in the House of Representatives.
Losing either chamber would let Democrats block Trump's agenda for his final two years in office and launch investigations into an administration that has so far faced largely compliant Republican majorities.
More than 52 million people have already voted in person or by mail, according to the University of Florida's Election Lab, a record for a midterm and up from nearly 46 million who voted before election day in 2022.
Thirty-five Senate seats and all 435 House seats are on the ballot, with first results starting to flow on Wednesday morning in Australia.
with AP
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