A protester held a sign ripping President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE as a “coward” alongside the funeral procession for the late Sen. John McCain John Sidney McCainCindy McCain endorses Biden: He's only candidate 'who stands up for our values' Biden says Cindy McCain will endorse him Biden's six best bets in 2016 Trump states MORE (R-Ariz.) in Washington on Saturday.

“POW McCain hero, Trump coward,” the sign read.

As the hearse carrying McCain's coffin leaves the National Cathedral, someone is holding up a sign reading, "POW MCCAIN HERO. TRUMP COWARD." pic.twitter.com/OJDJ7OvYkw — David Mack (@davidmackau) September 1, 2018

The message was clearly visible in news coverage of the procession carrying McCain’s casket from the Washington National Cathedral.

McCain died Aug. 25 at age 81 from an advanced form of brain cancer.

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Former Presidents Obama and George W. Bush delivered eulogies at McCain's funeral service in Washington. McCain’s daughter Meghan McCain also gave a powerful speech that took several swipes at Trump.

Trump was not invited to the funeral service. The president and senator had a contentious relationship that continued even into McCain’s death, with Trump declining to issue a statement on McCain until two days after his death.

Trump famously mocked McCain for being a prisoner of war during Vietnam, saying during the 2016 presidential race: "He was a war hero because he was captured. I like people who weren't captured."

Trump has been criticized by McCain and others for receiving five deferments from the draft during the Vietnam War, at least one of which cited bone spurs.

McCain will be buried Sunday in a private service at the U.S. Naval Academy in Annapolis, Md.