President Donald Trump is scheduled to participate in Washington, D.C.'s July Fourth celebrations with a rally and speech before fireworks on Saturday -- during what's expected to be sweltering heat in the nation's capital.The "Salute to America 250 Celebration & Fireworks" celebration begins in Washington, D.C., at 7 p.m. Saturday -- when temperatures are set to feel as high as 107 degrees, according to the forecast.President Donald Trump delivers remarks during an event at the Burning Hills Amphitheatre, July 1, 2026 in Medora, North Dakota.Andrew Harnik/Getty ImagesTrump told reporters on Wednesday that he won't be deterred by the heat."It’s going to be approximately 107 degrees out, and I’m going to go, and I’m going to make a really long speech just to show that I can do anything," he said.Viewers can watch Trump's speech live on ABC News' website. Exact details about Trump's planned speech have not yet been released.The president is slated to speak around 9:45 p.m., according to the schedule posted by Freedom 250, a public-private partnership launched by the White House in December. Freedom 250 is separate from America250, the congressionally established commission overseeing the broader national commemoration.A visitor reacts to the heat while attending the Great American State Fair on the National Mall, July 1, 2026, in Washington.Nathan Howard/AP PhotoOfficials say they are preparing for the extreme heat and for the thousands of guests that are scheduled to attend.Attendees will not be permitted to bring coolers into the primary secured viewing area, but officials said hydration will be available inside. Medical response plans include first-aid tents, additional ambulances, bicycle teams and multiagency response teams.Officials said the secured viewing area for the fireworks on the Washington Monument grounds has a capacity of approximately 150,000 people and is expected to fill early.The event, billed as the largest display ever held over the National Mall, will feature 850,000 pyrotechnic effects and fireworks, event organizers said. The fireworks are expected to begin between 10:30 p.m. and 11 p.m. and last approximately 35 minutes, launching from 10 sites around the National Monument, Freedom 250 and D.C. officials said.In previous years, the fireworks began around 9 p.m.Popular Reads"This firework display will light up the skies over our capital as a tribute to them, and a reminder to every American watching that our greatest chapters are still ahead. It's a moment to come together, look up, and feel proud of who we are and where we're going," Freedom 250 CEO Keith Krach said in a statement.Visitors attend the Great American State Fair on the National Mall, July 1, 2026, in Washington.Nathan Howard/AP PhotoThe celebration will also include several military flyovers. Ronald Reagan Washington National Airport is expected to close beginning at noon on July Fourth to accommodate the aerial demonstrations."The Fourth of July Airshow, over Washington, D.C., our Great Capital, will be the biggest, by far, in the History of the United States of America. Hundreds of Planes, of different types, sizes, and speeds, will be on display," Trump said in a social media post last week.President Donald Trump delivers remarks flanked by Rough Riders re-enactors, portraying the 1st United States Volunteer Cavalry after attending the opening of the Theodore Roosevelt Presidential Library in Medora, North Dakota, July 1, 2026.Saul Loeb/AFP via Getty ImagesTrump's speech comes as Trump and his administration have faced pushback for controversial domestic and international policies. The president also faces low approval ratings -- though a June Quinnipiac poll found them up from the lowest of his second term.According to the poll, 38% of voters approve of Trump and 55% disapprove (in May it was 34% to 58%).Quinnipiac found majorities of voters disapproved of the way that Trump is handling immigration issues, the economy, foreign policy and the ongoing war with Iran.Signage and security fencing warns of explosives along the Lincoln Memorial Reflecting Pool ahead of July 4th events on the National Mall, July 1, 2026, in Washington.Nathan Howard/AP PhotoThe president has also come under fire for several construction and renovation projects in Washington, including the demolition of the White House's East Wing to make way for a multi-million dollar ballroom and the repainting of the Lincoln Memorial Reflecting Pool.The Reflecting Pools has been closed off to visitors following the peeling paint and algae in the water shortly after the renovation was initially deemed complete.ABC News' Beatrice Peterson contributed to this report.