Rep. Don Beyer (D-Va.) fired back at President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE for saying Democrats were “treasonous” for not applauding him during his State of the Union, saying Trump “doesn’t know what ‘treason’ means.”

"He should study Article III of the United States Constitution, which he clearly hasn't read,” Beyer tweeted Monday.

.@realDonaldTrump doesn't know what "treason" means. He should study Article III of the United States Constitution, which he clearly hasn't read.



The Founders were concerned that a despot might abuse their powers of office to attack political enemies. Smart people, the Founders. https://t.co/dipn2faX8K — Rep. Don Beyer (@RepDonBeyer) February 5, 2018

Article III of the Constitution lays out the U.S. judicial system and includes the definition for treason.

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“Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort,” it reads.

The Democrat’s response came just hours after Trump called Democrats “un-American” and “selfish” for not standing and applauding when he mentioned achievements from his first year in office during his State of the Union address last week.

"Can we call that treason? Why not?" Trump said. "They certainly didn't seem to love our country very much."

He suggested that the lack of a show of support for him would make it difficult for him to work with Democrats on government spending and immigration legislation.