Marjorie Taylor Greene didn't just resign from the US Congress -- she detonated a political grenade on her way out, blasting open cracks in a dam that some fear could unleash a flood of Republican exits.

The 51-year-old conservative provocateur stunned Washington last week with a blistering attack on President Donald Trump's second-term agenda and the Republican leadership she accused of betraying voters.

Her departure announcement immediately fueled talk that more exhausted or exasperated Republicans may follow -- a dangerous prospect for a House of Representatives majority hanging by a thread.

"The honeymoon's over and some Republicans are realizing this isn't what they signed up for," political analyst Andrew Koneschusky, a former Senate staffer, told AFP.

"The discontent is multifa

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