treasonous

He went on, “It’s an amazing act of cowardice, and ultimately, it’s treasonous to the conservative cause.”
Republicans are fighting among themselves — keep it going|Peter Rosenstein|September 8, 2022|Washington Blade
Tony Perkins, president of the anti-LGBTQ Family Research Council, crowed in a statement against the Equality Act, which he called “a grave and treasonous threat to our nation’s core values” over the lack of Republican support.
In first, GOP compromise on LGBTQ rights expected to win Democratic support|Chris Johnson|February 24, 2021|Washington Blade
A special military tribunal had found him guilty of treasonous activities and other crimes.
North Korean Blood Feud is ‘Richard III’ with Nukes|Gordon G. Chang|December 13, 2013|DAILY BEAST
It goes on to say that a court needs two witnesses to the treasonous act.
‘A Ghastly Waste of Time?’ Considering the Constitution|Seth Lipsky|January 15, 2013|DAILY BEAST

Some of the same folks who called BDS treasonous see ODS as part of a patriotic resistance.
The Obama Haters Book Club: The Canon Swells|John Avlon|October 26, 2012|DAILY BEAST
For Perry to say we can't control the Mexican border, he declared, is "pretty much a treasonous comment."
Romney Puts Perry on Defensive|Howard Kurtz|September 13, 2011|DAILY BEAST
People who study the right have worried for months about the consequences of paranoid beliefs about treasonous government plots.
The Cult Web Film that Inspired Loughner|Michelle Goldberg|January 13, 2011|DAILY BEAST
Treasonous ambition in Macbeth collides with loyalty and patriotism in Macduff and Malcolm: here is the outward conflict.
Shakespearean Tragedy|A. C. Bradley
Though a treasonous tool Of rebelry, he should be held by me A prisoner of knightliest war.
The Mortal Gods and Other Plays|Olive Tilford Dargan
A treasonous tempest rises, and you stand A god indifferent when you should bethink Yourself most mortal.
The Mortal Gods and Other Plays|Olive Tilford Dargan
On the top of it not half of us can stand; wherefore there arises indecent shoving, nay treasonous irreverent growling.
The French Revolution|Thomas Carlyle
Nor would he be this, but for a thought that inspires, while keeping him true to his treasonous intent.
The Lone Ranche|Captain Mayne Reid

Origin of treasonous