Flake: It's not a joking matter to call someone treasonous

Sen. Jeff FlakeJeffrey (Jeff) Lane FlakeHillicon Valley: EU hits Google with record B fine | Trump tries to clarify Russia remarks | Sinclair changing deal to win over FCC | Election security bill gets traction | Robocall firm exposed voter data Overnight Defense: More Trump drama over Russia | Appeals court rules against Trump on transgender ban | Boeing wins Air Force One contract | Military parade to reportedly cost M Senate resolution backs intelligence community on Russian meddling MORE (R-Ariz.) on Sunday pushed back on the White House's characterization that President TrumpDonald John TrumpIran claims it rejected Trump meeting requests 8 times ESPY host jokes Putin was as happy after Trump summit as Ovechkin winning Stanley Cup Russian ambassador: Trump made ‘verbal agreements’ with Putin MORE was joking when he called Democrats "treasonous" for not clapping at the State of the Union, saying the president's comments are not a joking matter. 

"I don't think it's a joking matter to say that somebody is treasonous, and he ought to stop it," Flake told NBC's Chuck Todd on "Meet the Press." 

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"Words matter," the Republican senator, who recently announced his retirement, said. "When he talks about fake news, for example, I gave another speech about how that gives aid and comfort to authoritarians around the world who are now labeling their opposition or dismissing real dissent as fake news.

"So these things matter." 

Flake has often criticized the president. Earlier this month, he ripped Trump after the president suggested it was treason for Democrats not to applaud during his State of the Union speech, saying the remarks were "not normal." 

"One who levels such a charge knows neither the meaning of treason nor the power that the words of a president carry. ... Our silence will also mark the day that we failed to recognize that this conduct in an American president is simply not normal," the senator said during a speech on the Senate floor. 

White House spokesman Hogan Gidley said the president's comments were "tongue-in-cheek."