Amy McGrath, a retired Marine fighter pilot whose unsuccessful 2018 House campaign attracted national attention, will challenge Senate Majority Leader Mitch McConnell for his Kentucky Senate seat, she announced Tuesday.

The highly anticipated announcement keys up what is likely to be one of the most closely watched and well-funded matchups of the 2020 congressional campaign cycle, although even Democratic supporters have acknowledged that McGrath faces long odds to unseat one of the most powerful members of the GOP.

In a video announcing her campaign released early Tuesday, McGrath portrays McConnell as at the root of rancor and dysfunction in Washington.

“Everything that’s wrong in Washington had to start someplace. How did it come to this?” McGrath says in a video announcing her campaign. “Well it started with this man, who was elected a lifetime ago, and who has bit by bit, year by year, turned Washington in something we all despise. Where dysfunction and chaos are political weapons. Where budgets and health care and the Supreme Court are held hostage. A place where ideals go to die.”