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 drew loud boos and chants of "lock him up" during his appearance on the scoreboard at Nationals Park for Game 5 of the World Series on Sunday.

Trump was sitting in the stands along with some of his closest Republican allies, including House Minority Leader Kevin McCarthy Kevin Owen McCarthyHouse to vote on resolution affirming peaceful transition of power Ginsburg becomes the first woman to lie in state in the Capitol McCarthy says there will be a peaceful transition if Biden wins MORE (Calif.), House Republican Conference Chairwoman Liz Cheney Elizabeth (Liz) Lynn CheneyGOP lawmakers distance themselves from Trump comments on transfer of power Graham vows GOP will accept election results after Trump comments Liz Cheney promises peaceful transfer of power: 'Fundamental to the survival of our Republic' MORE (Wyo.) and House Minority Whip Steve Scalise Stephen (Steve) Joseph ScaliseGinsburg becomes the first woman to lie in state in the Capitol House GOP slated to unveil agenda ahead of election House panel details 'serious' concerns around Florida, Georgia, Texas, Wisconsin elections MORE (La.). Other GOP members of Congress present included Sens. Lindsey Graham Lindsey Olin GrahamLincoln Project mocks Lindsey Graham's fundraising lag with Sarah McLachlan-themed video The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election Trump dumbfounds GOP with latest unforced error MORE (S.C.) and David Perdue (Ga.).

According to multiple reporters at the scene, the audience erupted into boos when the group appeared on the scoreboard. Some members of the crowd then began a brief "lock him up" chant, an echo of the popular "lock her up" chant directed at former Secretary of State Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE that can often be heard at Trump's rallies.

Loud, sustained boos for Trump at Nats Stadium when he was announced. Maybe loudest crowd cheer of the night. — Josh Dawsey (@jdawsey1) October 28, 2019

Both cheers and boos for Pres Trump at game 5 of the #WorldSeries: pic.twitter.com/KSXiCnsczR — Frank Thorp V (@frankthorp) October 28, 2019

And then a brief smattering of “LOCK HIM UP!” after Pres Trump was introduce at Game 5 of the #WorldSeries pic.twitter.com/I7r2KAFqrx — Frank Thorp V (@frankthorp) October 28, 2019

A group of military veterans also joined the president's sizable entourage in the seats.

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"At the #WorldSeries2019 w/ my friend @SteveScalise as guest of my friend @realDonaldTrump. Doesn’t get better than this! #TakeItBack," tweeted Rep. Kevin Brady Kevin Patrick BradyBusinesses, states pass on Trump payroll tax deferral Trump order on drug prices faces long road to finish line On The Money: US deficit hits trillion amid pandemic | McConnell: Chance for relief deal 'doesn't look that good' | House employees won't have payroll taxes deferred MORE (R-Texas).

Sunday's game comes as the World Series is split 2-2 between the Houston Astros and Washington Nationals.

The game was also attended by a top critic of the president, celebrity chef José Andrés, who threw out the first pitch prior to Trump's arrival at the game. MLB Commissioner Rob Manfred said earlier this week that Trump had offered to arrive after the game started and not throw out the first pitch to minimize distractions for fans at the stadium.

“His view was that in order to make the fan experience as positive as possible, he would arrive at Game 5 sometime after the game began, so that wouldn’t interfere with fans getting into the stadium. Quite frankly, we were very grateful for that,” Manfred told The Associated Press.