A super PAC supporting Nikki Haley’s presidential campaign said on Tuesday that it had reserved more than $13 million in television and digital ads in Iowa and New Hampshire starting in August. The outlay is the first major advertising push in support of Ms. Haley since she became the first Republican to challenge former President Donald J. Trump this year.

The group, SFA Fund Inc., is pouring $7 million into ads in Iowa and $6.2 million into ads in New Hampshire that will run over the next nine weeks. The first television ad features Ms. Haley, 51, a former South Carolina governor and United Nations ambassador, talking tough on China at a political rally, arguing that the country’s leaders “want to cover the world in communist tyranny.”

A voice-over says, “Nikki Haley: tough as nails, smart as a whip, unafraid to speak the truth.”

Polls show Ms. Haley stuck in the single digits in a primary race that has been dominated by Mr. Trump.

The first New York Times/Siena College poll of the 2024 campaign showed Mr. Trump with the support of 54 percent of likely Republican primary voters, while Ms. Haley trailed far behind with just 3 percent, the same level of support as former Vice President Mike Pence and Senator Tim Scott of South Carolina.

Ms. Haley has until now relied on free television and press coverage that has come from her brisk clip of events and appearances in Iowa and New Hampshire, where she has spent more time campaigning than most of her rivals.

In a memo published this month, Mark Harris, SFA Fund’s lead strategist, said the group was gearing up to begin “an aggressive voter contact campaign” as Ms. Haley enters the next phase of the race. “Nikki Haley understands that China’s growing influence poses a monumental threat to the United States,” Mr. Harris said in a statement announcing the ads.

In Iowa, Republican campaigns have spent $31.8 million so far this year, according to the media tracking firm AdImpact. The $7 million campaign would make SFA Fund the second-largest spender in the state, behind only Mr. Scott’s Trust in the Mission PAC, or TIM PAC, which has spent more than $15.3 million. Never Back Down, a super PAC supporting Gov. Ron DeSantis of Florida, has spent the next-highest amount, with $3.4 million in ads.

Spending in New Hampshire has totaled only $3.4 million. TIM PAC has been the largest spender there, too, having invested $1.1 million in ads.

Ms. Haley raised $7.3 million through her presidential campaign and affiliated committees from April through June, a modest sum that nevertheless revealed her robust appeal to small donors. SFA Fund had $17 million in cash on hand as of the end of June.