WASHINGTON — Crews are again draining the Lincoln Memorial Reflecting Pool as President Donald Trump’s problem-plagued efforts to revamp the waterway pushes well past his initial goal of having it ready by July 4 to mark the nation’s 250th birthday.

The president at first suggested his renovations would last a century. But, within weeks of the project originally reaching completion last month, the water was beset by an algae bloom and pieces of the new coating appeared to be peeling off the bottom.

Trump has blamed the peeling on vandals, though critics allege it’s from shoddy repair work.

Interior Secretary Doug Burgum, whose agency oversees the National Park Service, told conservative podcaster Katie Miller in an interview released earlier this week that the new round of draining was planned. He also said that the water might still contain debris from an extensive Independence Day fireworks display over the National Mall.

“Drain the water, clean up the fireworks stuff,” Burgum told Miller, who is the wife of deputy White House chief of staff Stephen Miller. “Repair the vandalism that was done. Fill it back up again.”

The work on the Reflecting Pool is just one of a number of projects Trump has spearheaded across the nation’s capital. Most prominently, he demolished the White House’s East Wing to build a $400 million ballroom and plans to build a towering arch between the Lincoln Memorial and Arlington National Cemetery.

He initially announced his intentions to beautify the Reflecting Pool this spring, saying he wanted it completed before the nation’s 250th birthday celebrations.

Water was drained and Trump directed that the bottom be painted what he called “American flag blue.” In May, the president posted on his social media site of the pool: “The goal is to have it done, at this higher level, prior to July 4th — We are ahead of schedule!”

But problems began quickly after the initial work was finished. Trump blamed vandals, and court documents later showed that the National Park Service reported to the U.S. Park Police a June 9 incident in which a sharp knife or razor cut the pool’s new liner.

On Thursday, former Olympic canoe racer David Hearn pleaded not guilty in D.C. Superior Court to deliberately damaging the Reflecting Pool. Hearn has said he reached inside the pool to examine the peeled sealant and let go of a chunk when he was told to by a park worker.

His attorneys and other Trump administration critics have derided the case as an abuse of prosecutorial power and maintain he is being scapegoated for the poor job done fixing up the Reflecting Pool.

At least three other people have been charged in the same court with misdemeanors for allegedly removing pieces of paint from the Reflecting Pool, according to online court records. All three pleaded not guilty during their initial court appearances Wednesday.

The pool was closed for the Independence Day celebration, which featured what Trump said was the largest fireworks display in the world. The president had said that the pool would have to be drained anew as part of the new round of repairs.

Burgum has also said that the Trump administration won’t seek bids for the new rounds of repairs. He told CNN’s “State of the Union” last weekend: “We’ll use the same company because they did a fantastic job.”

Ohio-based Green Water Solutions, also known as Greenwater Services, was given a $1.7 million contract to install a water-purification system in the Reflecting Pool, while Virginia-based Atlantic Industrial Coatings was awarded $14.7 million to repaint and waterproof the pool’s concrete floor.

Democratic senators and House members are investigating the pool project, including seeking answers about how much taxpayer funding is involved.