In a televised interview that was expected to cover familiar political ground, Representative Marjorie Taylor Greene of Georgia delivered a rare public rebuke of former President Donald J. Trump, triggering unease across the Republican Party’s pro-Trump faction and prompting renewed scrutiny of internal tensions within the MAGA movement.

The remarks came during a sit-down discussion late Monday, when Ms. Greene—long one of Mr. Trump’s most vocal and loyal allies—shifted from defending the former president to describing what she characterized as “patterns of behavior” within his orbit that have placed her and her family in difficult or dangerous situations. Though she did not provide specific examples, she suggested that private conversations and pointed rhetoric from Mr. Trump had contributed to threats she has recently received.

“When certain things are said publicly, people take them as a signal,” Ms. Greene said, referencing an instance in which Mr. Trump mocked her by calling her “Marjorie Traitor Greene,” a remark that circulated widely online earlier this year. “When those words come from someone with that kind of following, they activate people. It has real-world consequences.”

Her comments stopped short of a full denunciation, but the tone—a mix of frustration, caution, and emotional fatigue—appeared to surprise even members of her own staff, according to two people familiar with the interview’s preparation. It was the first time Ms. Greene had publicly implied that Mr. Trump or his supporters might bear responsibility for threats made against her, and the shift was immediately interpreted by political observers as a sign of growing friction within a movement that has long prided itself on unity.

The reaction within Trump-aligned circles was swift. Several Republican aides, speaking on condition of anonymity to discuss private conversations, said they were “caught off-guard” by the remarks. One senior adviser to a prominent MAGA-aligned lawmaker said there was “intense concern” that the interview might signal the beginning of a more pronounced rift between Ms. Greene and elements of Mr. Trump’s political operation.

While Ms. Greene has positioned herself as one of the former president’s most steadfast defenders—regularly amplifying his claims of political persecution and attacking his critics—she has also increasingly carved out a distinct brand, occasionally clashing with fellow Republicans and navigating competing demands from her party’s right-wing base.

Her latest comments, however, represent a deeper and more personal point of tension, one that touches on the political intensity surrounding Mr. Trump’s public statements and the extent to which his followers interpret his language literally. For years, scholars, law-enforcement officials, and civil-rights organizations have warned that aggressive or dehumanizing political rhetoric may exacerbate threats against public officials. Ms. Greene has often dismissed such concerns. Now, she appears to be acknowledging their impact.

The interview clip circulated widely across social media platforms within hours, drawing hundreds of thousands of views and sparking heated debate among conservative commentators. Some accused Ms. Greene of disloyalty, while others defended her as taking a principled stand against political vitriol. A number of far-right influencers, who typically reserve criticism for establishment Republicans, expressed surprise at her decision to raise the issue publicly rather than address it privately with Mr. Trump.

Advisers close to the Trump campaign declined to comment on the substance of Ms. Greene’s remarks but privately played down the significance of the episode, arguing that disagreements between prominent allies were neither new nor indicative of deeper instability. Still, other GOP strategists warned that even small fractures could widen as the party enters a high-stakes election cycle.

Ms. Greene, for her part, has remained quiet since the interview aired, offering no further clarification. Whether her comments represent a momentary rupture or the beginning of a broader recalibration remains to be seen. But her decision to speak publicly about the potential consequences of Mr. Trump’s rhetoric underscores a growing challenge for the former president: balancing the loyalty of his most fervent supporters with the long-building strain inside a movement defined as much by personal allegiance as by policy.

For now, the episode has injected fresh uncertainty into the Republican landscape, raising questions about how the dynamics within the MAGA coalition may shift as the political pressures of the coming year intensify.