Former U.S. Ambassador to Japan Bill Hagerty released his first television ad Monday, focusing on the ongoing impeachment effort of President Donald Trump.

In the 30-second ad, dubbed "Enough is Enough," a narrator says Democrats have wanted to impeach Trump since he took office in 2017.

Throughout the TV spot that started airing Monday, viewers see images of recognizable Democrats, including House Speaker Nancy Pelosi, Senate Minority Leader Chuck Schumer, U.S. Reps. Alexandria Ocasio-Cortez and Adam Schiff, and U.S. Sens. and presidential candidates Bernie Sanders and Elizabeth Warren.

"They know they can't beat Trump at the ballot box, so they're trying to steal the next election," the narrator says.

When Hagerty appears, the ad includes large white text that states, "Endorsed by Trump," a reference to the president's backing of the Tennessean before he even launched his Senate campaign.

"It's time for the impeachment sham and witch hunt to come to an end," says Hagerty, who vows to take on the "do-nothing Democrats and put America first."

The ads are set to run on FOX cable and CNBC. The campaign is considering expanding the ad buy to network television.

The new TV ad is the first for Hagerty's campaign, and comes after his main Republican opponent, Nashville trauma surgeon Manny Sethi began running his own spots.

In addition to Hagerty and Sethi, others vying for the Republican nomination include East Tennessee physician Josh Gapp, Memphis millionaire George Flinn and Byron Bush, who ran for the U.S. Senate in 1994 and began airing ads on television in November.

Democrats vying for the seat include Nashville attorney and Iraq War veteran James Mackler, Memphis environmental activist Marquita Bradshaw, Nashville professor Diana Onyejiaka and Gary Davis, who unsuccessfully ran in 2018.

The various candidates are seeking to succeed U.S. Sen. Lamar Alexander, who is retiring.

The ads from Hagerty, Sethi and Bush have begun hitting airwaves significantly earlier than Tennessee's 2018 U.S. Senate race. During that race, which saw then-U.S. Rep. Marsha Blackburn square off against former Gov. Phil Bredesen, the Democrat began airing his ads in March. Blackburn, who defeated Bredesen, waited until August before launching her first ads.

TENNESSEE POLITICS:Bill Hagerty raises $1.9 million from donors during first month in U.S. Senate race

TENNESSEE POLITICS:Trump Jr. to visit Gallatin to boost Hagerty U.S. Senate bid

Want to read more stories like this? A subscription to one of our Tennessee publications gets you unlimited access to all the latest politics news, podcasts like Grand Divisions, plus newsletters, a personalized mobile experience and the ability to tap into stories, photos and videos from throughout the USA TODAY Network's 261 daily sites.

Reach Joel Ebert at jebert@tennessean.com or 615-772-1681 and on Twitter @joelebert29.