Americans for Prosperity Action, a key component of the political network founded by the billionaire Koch brothers, is endorsing Nikki Haley in the GOP presidential primary, the group announced in a memo Tuesday.

The endorsement represents a significant boost for Haley less than two months from the first GOP nominating contest in Iowa, where Haley is virtually tied for second place with Florida Gov. Ron DeSantis. Haley has been steadily rising in polls as the main alternative to Donald Trump , the front-runner for the nomination, culminating in a critical moment for her campaign that AFP is well-positioned to aid.

AFP Action is proud to throw our full support behind Nikki Haley, who offers America the opportunity to turn the page on the current political era, to win the Republican primary and defeat Joe Biden next November. She has what it takes to lead a policy agenda to take on our nations biggest challenges and help ensure our countrys best days are ahead. With the grassroots and data capability we bring to bear in this race, no other organization is better equipped to help her do it, reads the memo from AFP Action senior adviser Emily Seidel .

The super PAC founded by Charles and the late David Koch had vowed to spend tens of millions of dollars to prevent Trump from becoming the 2024 nominee after sitting out the last two presidential election cycles. Already the group has spent heavily on anti-Trump mailers and other outreach to influence the election.