Twitter trolls Donald Trump for singing national anthem at Memorial Day ceremony

President Donald Trump joined Vice President Pence, Gen. James Mattis among other leaders at the Tomb of the Unknown Soldier on Memorial Day, where he paid a solemn tribute to the lost soldiers and participated in a wreath-laying ceremony.

And during the festivities, the president sang along to the "Star-Spangled Banner" during the opening of the ceremony -- a portion of the event which has since been picked apart by Twitter upon its debut.

Trump's voice could not be heard over the orchestra, but that has not stopped tweeters who were less than amused with the president's demeanor during the somber event.

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"Trump theatrically singing the national anthem like a 1st grader while Mattis looks like he's about to cry ... in rage and disgust," one person tweeted while another wrote, "He was dancing and singing to himself. It was a show about Trump. He looked like an idiot."

Several users speculated that the president, who stopped singing at several points oft the song, forgot part of the lyrics.

Others thought Trump appeared "jovial" swaying and singing during the ceremony in contrast to Mattis, who stood' straight-faced next to him.

However, many users defended the president and saw nothing wrong with the president singing along to the country's national anthem.

See some of the social reactions to the buzzed-about moment: