Rep. Elise Stefanik (R-N.Y.) will leave Congress after six terms representing upstate New York at the end of December. Her exit caps a dramatic political evolution from establishment Republican to one of President Donald Trump's closest allies, per a POLITICO report.

Stefanik recently hosted a high-profile Washington event celebrating her new book while quietly fueling speculation about future campaigns, Politico reports. The gathering attracted Republican operatives, lobbyists and longtime political supporters.

From Moderate To Trump Loyalist

Stefanik entered national politics as a younger Republican tied to mainstream conservative policy circles.

She previously worked on the Republican National Committee's post-2012 election review encouraging broader voter outreach.