The League of Conservation Voters is dropping $860,000 on an ad buy against Nevada Republican Senate candidate Joe Heck while another group is launching a new ad tying the congressman to his party’s presidential candidate.

The league’s ad says Nevada has created 25,000 clean energy jobs but Heck compromised them “when he votes big oil’s way,” the Reno Gazette Journal reported. The ad says he has received more than $300,000 in contributions from the oil and gas industry.

“Twenty five thousand Nevada jobs at risk,” the ad says. “Because Joe Heck’s in big oil’s pocket.”

The ad refers to Heck’s vote against an amendment in 2011 that would have banned new offshore leases for oil and natural gas production.

[New DSCC Ad Targets Heck Over Wall Street, Social Security]

Heck’s campaign called the ad “one of the most dishonest” and said it was another attack by Senate Minority Leader Harry Reid, who is retiring this year, and his annointed successor, former Nevada Attorney General Catherine Cortez Masto.

The ad will run statewide through Sept. 15 in Las Vegas and through Sept. 19 in the Reno area.

Meanwhile, the Senate Majority PAC’s ad, its first in Spanish, asks whether there is a difference between Heck and Republican presidential candidate Donald Trump on issues of immigration and education.

The ad says Heck voted four times against programs to allow children born in the U.S. or their parents to stay in the country, “putting thousands of DREAMers at risk of deportation.” It then follows with video of Trump saying, “We’re going to have a deportation force.”

Next, the ad says Heck voted to cut Pell grants, before switching to footage of Trump saying, “We’re going to cut the Department of Education.”