Republican presidential candidate Donald Trump released his first series of radio ads Thursday, marking the first time the billionaire has paid for advertising since stepping into the presidential race in June. ABC News reported Trump has bought radio air time in three crucial states: Iowa, New Hampshire and South Carolina.

“Donald Trump is running for president because politicians are all talk and no action," a woman’s voice says in one of the ads played during “Morning Joe” on MSNBC. The voice adds Trump will build a strong border, and “brutally and quickly cut off the head of ISIS.”

Trump himself speaks in another ad, targeting Iowa voters where he touts his track-record in negotiating business deals. He says he will do away with “Obamacare” and vows to help “make America great again.”

“Politicians are all talk, no action,” Trump says in the ad. “If the people of Iowa vote for me, you’ll never be disappointed.”

Trump’s campaign put out a press release Wednesday evening saying the radio buy was valued at $300,000 and would last through the end of November, the New York Times reported. The ads come as Trump has seen his popularity dip in the polls.

A recent Wall Street Journal-NBC News poll revealed retired neurosurgeon Dr. Ben Carson had forged ahead Trump as the front-runner in the race for the Republican Party’s presidential nomination. The poll marked the first time since June a candidate other than Trump has been the top GOP choice. Trump held 23 percent of support while Carson took the lead with 29 percent. Florida Sen. Marco Rubio followed in third with 11 percent, and Texas Sen. Ted Cruz was fourth with 10 percent. Former Florida Gov. Jeb Bush received 8 percent.