Those Trump Jr. allies were recently told that Stefanik’s camp was behind an effort to plant negative stories about Rep. Jim Banks (R-Ind.), a potential Stefanik competitor in House GOP leadership. It was also relayed to them that part of the effort involved bringing up Fox News host Tucker Carlson’s son, Buckley — an aide to Banks — according to three Republicans familiar with the conversations.

Intermediaries for Trump Jr.’s camp conveyed to Stefanik backers that they believed she had crossed a line by bringing up Carlson’s child, according to two of those Republicans.

POLITICO was unable to confirm the veracity of the pro-Stefanik whisper campaign against Banks. But whether real or rumor, the pushback from allies of the former president’s eldest son could imperil the New York Republican’s hopes of elevating to a bigger party post. One year after deposing anti-Trump Rep. Liz Cheney (R-Wyo.) from the No. 3 House Republican post, Stefanik is now considered a contender for the whip’s role in a potential GOP majority next year.