Sen. Lamar AlexanderAndrew (Lamar) Lamar AlexanderOvernight Health Care: House passes .3T omnibus | Bill boosts funds for NIH, opioid treatment | Senators spar over ObamaCare fix | 'Right to Try' bill heads to the Senate Overnight Regulation: Omnibus includes deal on tip-pooling rule | Groups sue over rules for organic livestock | AT&T, DOJ make opening arguments in merger trial Warren presses Mulvaney, Azar on tip pooling MORE (R-Tenn.), boosted by a significant second-quarter fundraising sum, is going on air with an ad that features Sen. Rand PaulRandal (Rand) Howard PaulMichael Steele: Congress must lead on cannabis reform and stand with the American public Lawmakers renew call for end to 'black budget' secrecy McCain asks Trump's CIA pick to explain ties to torture MORE (R-Ky.) touting his work defending fishing access.

Alexander brought in $2 million in the second quarter, a campaign aide confirmed, and is going on air with a $180,000 buy.

The aide said Alexander had already planned to go up with reelection ads early in the 2014 cycle and decided to focus the ad on the Freedom to Fish Act because it's an issue Tennesseans care about.

But it's also an issue that allows Alexander to highlight his work curbing government regulations, something that appeals to Tea Party voters.

Conservatives have indicated they'd like to challenge Alexander in a primary next year, with the Senate Conservatives Fund telling supporters last week that his vote for the immigration reform measure that passed the Senate makes him open to a primary challenger that they'd be willing to back.

"We don't want a government that's strong enough to make our lives risk-free. We can do that for ourselves," Alexander says in the video.

Paul's inclusion in the video is designeded to boost Alexander's credibility among the grassroots Tea Party activists. 

"Nobody wants to say no to Lamar Alexander," Paul says in the ad.

The Freedom to Fish Act also features prominently in a Web video released by the campaign of Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellYou just can't keep good health policy down Trump threatens to veto omnibus over lack of wall funding, DACA fix Democrats desperate for a win hail spending bill MORE (R-Ky.), who is also considered to be vulnerable to a primary challenge.

Watch the ad: