A new poll of likely Iowa caucus-goers appears to back up Louisiana Gov. Bobby Jindal’s presidential campaign’s claims that he’s gaining momentum there.

Gravis Marketing surveyed 227 Republican Caucus participants and found Jindal in fourth place, at 7.2 percent and trailing former Florida Gov. Jeb Bush (10%), Wisconsin Gov. Scott Walker (15.4%) and Donald Trump (30.9%). The poll, released Friday, largely mirrors an internal Jindal campaign poll released to the media last week, which also showed him in fourth place behind the same three candidates and polling at 8 percent.

Jindal has made Iowa a cornerstone of his effort to break through the crowded Republican presidential field.

He has spent extensive time there and is scheduled to return next week.

The Gravis poll was conducted July 29 for the conservative cable news station One American News Network. The poll’s margin of error is 6.5 percent for the GOP caucus question.

Jindal’s in-house poll was conducted July 19-21 by OnMessage Inc., Jindal’s Virginia-based political consulting firm. OnMessage had contacted 600 Republicans by telephone for live interviews, and the poll’s margin of error was 4 percent.